diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c6a62c..bb88450 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -41,4 +41,7 @@
 ### 0.4.4
 - removed unwanted 'continue' from koi-worker; added explicit cast for wait time
 ### 0.4.5
-- force a reconnect even of status variable indicates we are online
\ No newline at end of file
+- force a reconnect even of status variable indicates we are online
+### 0.4.6
+- optionally skip the caching of new samples, usefull if we just want to send them and never consume or read back.
+- added optional sleep time for instances that just changed, this prevents premature training of instances while someone else is writing to them#
diff --git a/cpu-tf.Dockerfile b/cpu-tf.Dockerfile
index 4bdb701..5da0ad3 100644
--- a/cpu-tf.Dockerfile
+++ b/cpu-tf.Dockerfile
@@ -3,7 +3,7 @@
 # convenience, we added tensorflow-hub to the image, so you can use pretrained
 # models from TensorFlow Hub.
 
-FROM tensorflow/tensorflow:2.11.0
+FROM tensorflow/tensorflow:2.13.0
 
 COPY ./dist/ /wheels/
 
diff --git a/koi_core/api/instance.py b/koi_core/api/instance.py
index b3b5ae4..64ff970 100644
--- a/koi_core/api/instance.py
+++ b/koi_core/api/instance.py
@@ -28,6 +28,7 @@
     "finalized": "finalized",
     "could_train": "could_train",
     "last_modified": "last_modified",
+    "sample_last_modified": "sample_last_modified",
 }
 
 
@@ -96,9 +97,6 @@ def get_instance_training_data(self, id: InstanceId, meta: CachingMeta):
     def set_instance_training_data(self, id: InstanceId, data: bytes):
         self.base._POST_raw(self.base._build_path(id) + "/training", data=data)
 
-    # endregion
-
-    # region descriptor
     def get_descriptors(self, id: InstanceId, meta: CachingMeta = None):
         data, meta = self.base._GET(self.base._build_path(id) + "/descriptor")
         return (
diff --git a/koi_core/control/control.py b/koi_core/control/control.py
index 91c8936..cbde4d4 100644
--- a/koi_core/control/control.py
+++ b/koi_core/control/control.py
@@ -60,6 +60,8 @@ def _set_instance(instance: Instance, max_instances: int = 1):
 
 
 def train(instance: Instance, batch_iterable=None, dev=False, max_instances=1):
+    global _runable_instance
+
     if dev:
         temp_dir = TemporaryDirectory()
         model = instance.load_code(temp_dir.name)
@@ -67,10 +69,16 @@ def train(instance: Instance, batch_iterable=None, dev=False, max_instances=1):
         temp_dir.cleanup()
     else:
         _set_instance(instance, max_instances)
-        _runable_instance.train(batch_iterable)
+        try:
+            _runable_instance.train(batch_iterable)
+        except:
+            kill_runable_instance()
+            raise
 
 
 def infer(instance: Instance, data, dev=False, model=None, max_instances=1) -> List[Any]:
+    global _runable_instance
+
     if dev:
         temp_dir = None
 
@@ -86,7 +94,27 @@ def infer(instance: Instance, data, dev=False, model=None, max_instances=1) -> L
 
     else:
         _set_instance(instance, max_instances)
-        return _runable_instance.infer(data)
+        try:
+            return _runable_instance.infer(data)
+        except:
+            kill_runable_instance()
+            raise
+
+
+def kill_runable_instance():
+    global _runable_instance
+    global _active_instances
+
+    if _runable_instance is None:
+        return
+    
+    instance = _runable_instance.instance
+
+    _runable_instance.terminate()
+    _runable_instance = None
+
+    if instance in _active_instances:
+        del _active_instances[instance]
 
 
 def terminate():
diff --git a/koi_core/data/simple_accessor.py b/koi_core/data/simple_accessor.py
index 8568bd7..4a53e5d 100644
--- a/koi_core/data/simple_accessor.py
+++ b/koi_core/data/simple_accessor.py
@@ -23,12 +23,12 @@
 @cache
 def get_np(self: Union[SampleDatum, SampleLabel], meta) -> np.ndarray:
     f = BytesIO(self.raw)
-    return np.load(f), meta
+    return np.load(f, allow_pickle=False), meta
 
 
 def set_np(self: Union[SampleDatum, SampleLabel], value: np.ndarray) -> None:
     f = BytesIO()
-    np.save(f, value)
+    np.save(f, value, allow_pickle=False)
     self.raw = f.getvalue()
     setCache(self, 'np', None)
 
diff --git a/koi_core/resources/instance.py b/koi_core/resources/instance.py
index ea1d140..8461bbf 100644
--- a/koi_core/resources/instance.py
+++ b/koi_core/resources/instance.py
@@ -13,7 +13,6 @@
 # GNU Lesser General Public License is distributed along with this
 # software and can be found at http://www.gnu.org/licenses/lgpl.html
 
-from datetime import datetime
 from koi_core.caching import cache, offlineFeature
 from koi_core.resources.model import Model
 from koi_core.resources.ids import InstanceId, ModelId, SampleId, DescriptorId
@@ -183,7 +182,8 @@ class InstanceBasicFields:
     description: str
     finalized: bool
     could_train: bool
-    last_modified: datetime
+    last_modified: str
+    sample_last_modified: str
 
 
 class InstanceProxy(Instance):
@@ -285,8 +285,8 @@ def __init__(self, pool: "APIObjectPool", id: Union[InstanceId, ModelId]) -> Non
         self.descriptors = InstanceDescriptorAccessor(self)
         self.parameter = InstanceParameterAccessor(self)
 
-    def new_sample(self):
-        sample = self.pool.new_sample(self.id)
+    def new_sample(self, remote_only:bool=False):
+        sample = self.pool.new_sample(self.id, not remote_only)
         return sample
 
     def merge(self, instances: Iterable):
diff --git a/koi_core/resources/pool.py b/koi_core/resources/pool.py
index 9c4aff9..c3bd6a0 100644
--- a/koi_core/resources/pool.py
+++ b/koi_core/resources/pool.py
@@ -154,7 +154,8 @@ def new_instance(self, id: ModelId) -> Instance:
     def sample(self, id: SampleId, meta) -> Sample:
         return SampleProxy(self, id), meta
 
-    def new_sample(self, id: InstanceId) -> Sample:
+    def new_sample(self, id: InstanceId, cached:bool=True) -> Sample:
         sample = SampleProxy(self, id)
-        setIndexedCache(self, "sample", sample.id, sample)
+        if cached:
+            setIndexedCache(self, "sample", sample.id, sample)
         return sample
diff --git a/koi_core/worker.py b/koi_core/worker.py
index 269cb25..75f2f28 100644
--- a/koi_core/worker.py
+++ b/koi_core/worker.py
@@ -23,6 +23,8 @@
 import koi_core as koi
 from koi_core.exceptions import KoiApiOfflineException
 from time import sleep
+from datetime import datetime
+
 
 signal_interrupt = False
 
@@ -114,6 +116,13 @@ def main():
         default=60,
         help="Number of seconds to wait before a retry",
     )
+    p.add(
+        "-w",
+        "--wait-training",
+        type=int,
+        default=10,
+        help="Number of seconds a instance has to be untouched before atempting to train it",
+    )
 
     opt = p.parse_args()
 
@@ -193,9 +202,12 @@ def main():
                             instance.name,
                         )
                         continue
-
+                    
+                    # seconds since last instance update
+                    last_modified = datetime.fromisoformat(instance.sample_last_modified)
+                    sec_since_last_change = (datetime.utcnow() - last_modified).total_seconds()
                     # train the instance if its ready to train or the user forces it
-                    if opt.force or instance.could_train:
+                    if opt.force or (instance.could_train and sec_since_last_change > opt.wait_training):
                         try:
                             logging.info(
                                 "start to train instance %s/%s", model.name, instance.name
@@ -207,6 +219,13 @@ def main():
                             logging.exception(
                                 "instance %s/%s had an exception", model.name, instance.name
                             )
+                    else:
+                        if (instance.could_train and sec_since_last_change < opt.wait_training):
+                            logging.info(
+                                "skipping instance %s/%s, as data was not present or still changing.",
+                                model.name,
+                                instance.name
+                            )
 
             # break here if the user selected to run once
             if opt.once:
@@ -225,14 +244,17 @@ def main():
             if retries == 0:
                 # if the retry counter is initilizes with a negative value, we will try forever
                 logging.error("koi api is offline, giving up")
-                raise ex
+                sys.exit(-1)
 
             retries -= 1
             logging.error("koi api is offline, retrying in %d seconds", opt.sleep_retry)
             sleep((float)(opt.sleep_retry))
 
             # set the online flag and try to athenticate
-            pool.api.reconnect()
+            try:
+                pool.api.reconnect()
+            except:
+                logging.error("could not reconnect to koi api")
 
     logging.info("stopped")
     sys.exit(0)
diff --git a/pyproject.toml b/pyproject.toml
index 0f2a396..7c8bdaf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,12 +2,21 @@
 requires = ["setuptools>=61.0.0"]
 build-backend = "setuptools.build_meta"
 
+[tools.setuptools]
+packages = [
+    "koi_core",
+    "koi_core.api",
+    "koi_core.control",
+    "koi_core.data",
+    "koi_core.resources"
+]
+
 [project]
 name = "koi-core"
-version = "0.4.5"
+version = "0.4.6"
 description = "Runtime for the KOI-System including koi-worker"
 readme = "README.md"
-requires-python = ">=3.8,<3.11"
+requires-python = ">=3.8,<3.12"
 classifiers = ["Programming Language :: Python :: 3", "Operating System :: OS Independent", "License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)"]
 
 dependencies = [