diff --git a/RNS/Discovery.py b/RNS/Discovery.py
index f45295a8..2d26cd5d 100644
--- a/RNS/Discovery.py
+++ b/RNS/Discovery.py
@@ -489,7 +489,7 @@ class InterfaceDiscovery():
             threading.Thread(target=self.__monitor_job, daemon=True).start()
 
     def __monitor_job(self):
-        while self.monitoring_autoconnects:
+        while self.monitoring_autoconnects and RNS.Transport._should_run:
             time.sleep(self.monitor_interval)
             detached_interfaces = []
             online_interfaces = 0
diff --git a/RNS/Reticulum.py b/RNS/Reticulum.py
index 73ff1320..f114c680 100755
--- a/RNS/Reticulum.py
+++ b/RNS/Reticulum.py
@@ -192,7 +192,8 @@ class Reticulum:
 
             if RNS.Profiler.ran(): RNS.Profiler.results()
 
-            RNS.loglevel = -1
+            RNS.loglevel = RNS.LOG_NONE
+            RNS._detach_stdout()
 
     @staticmethod
     def sigint_handler(signal, frame):
diff --git a/RNS/Transport.py b/RNS/Transport.py
index 192ffdac..aac41ad7 100755
--- a/RNS/Transport.py
+++ b/RNS/Transport.py
@@ -40,6 +40,7 @@ from time import sleep
 from threading import Lock
 from .vendor import umsgpack as umsgpack
 from RNS.Interfaces.BackboneInterface import BackboneInterface
+from RNS import should_log as sl
 
 class Transport:
     """
@@ -146,6 +147,7 @@ class Transport:
     path_states_lock            = Lock()
     jobs_lock                   = Lock()
     cache_clean_lock            = Lock()
+    persist_lock                = Lock()
 
     # Transport control destinations are used
     # for control purposes like path requests
@@ -204,6 +206,8 @@ class Transport:
     identity                    = None
     network_identity            = None
 
+    _should_run                 = True
+
     @staticmethod
     def start(reticulum_instance):
         Transport.owner = reticulum_instance
@@ -481,7 +485,7 @@ class Transport:
 
     @staticmethod
     def jobloop():
-        while (True):
+        while (Transport._should_run):
             Transport.jobs()
             sleep(Transport.job_interval)
 
@@ -3175,10 +3179,11 @@ class Transport:
                 RNS.log("Saving path table to storage...", RNS.LOG_DEBUG)
 
                 serialised_destinations = []
-                for destination_hash in Transport.path_table.copy():
+                path_table = Transport.path_table.copy()
+                for destination_hash in path_table:
                     try:
                         # Get the destination entry from the destination table
-                        de = Transport.path_table[destination_hash]
+                        de = path_table[destination_hash]
                         interface_hash = de[IDX_PT_RVCD_IF].get_hash()
 
                         # Only store destination table entry if the associated
@@ -3186,7 +3191,10 @@ class Transport:
                         interface = Transport.find_interface_from_hash(interface_hash)
                         if interface != None:
                             # Get the destination entry from the destination table
-                            de = Transport.path_table[destination_hash]
+                            if not destination_hash in path_table:
+                                RNS.log(f"Skipping persist for path table entry {RNS.prettyhexrep(destination_hash)}, no longer in table", RNS.LOG_DEBUG)
+
+                            de = path_table[destination_hash]
                             timestamp = de[IDX_PT_TIMESTAMP]
                             received_from = de[IDX_PT_NEXT_HOP]
                             hops = de[IDX_PT_HOPS]
@@ -3306,12 +3314,23 @@ class Transport:
 
     @staticmethod
     def persist_data(background=False):
-        Transport.save_packet_hashlist(background=background)
-        Transport.save_path_table(background=background)
-        Transport.save_tunnel_table(background=background)
+        if Transport.persist_lock.locked(): return
+        with Transport.persist_lock:
+            Transport.save_packet_hashlist(background=background)
+            Transport.save_path_table(background=background)
+            Transport.save_tunnel_table(background=background)
+            gc.collect()
+
+    @staticmethod
+    def void_queues():
+        Transport.held_announces = {}
+        Transport.receipts = []
+        Transport.reverse_table = {}
 
     @staticmethod
     def exit_handler():
+        Transport._should_run = False
+        Transport.void_queues()
         if not Transport.owner.is_connected_to_shared_instance:
             Transport.persist_data()
 
diff --git a/RNS/__init__.py b/RNS/__init__.py
index 0024e4d6..af4f1f75 100755
--- a/RNS/__init__.py
+++ b/RNS/__init__.py
@@ -127,6 +127,9 @@ def timestamp_str(time_s):
 def precise_timestamp_str(time_s):
     return datetime.datetime.now().strftime(logtimefmt_p)[:-3]
 
+def should_log(level=3):
+    return loglevel >= level
+
 def log(msg, level=3, _override_destination = False, pt=False):
     if loglevel == LOG_NONE: return
     global _always_override_destination, compact_log_fmt
@@ -388,6 +391,10 @@ def exit(code=0):
         Reticulum.exit_handler()
         os._exit(code)
 
+def _detach_stdout():
+    sys.stdout = open(os.devnull, "w")
+    sys.stderr = open(os.devnull, "w")
+
 class Profiler:
     _ran = False
     profilers = {}