diff --git a/Switch2Bridge.py b/Switch2Bridge.py
index fcd5f90..a8797b6 100644
--- a/Switch2Bridge.py
+++ b/Switch2Bridge.py
@@ -66,7 +66,7 @@
 # ============================================================
 
 APP_NAME = "Switch2 Bridge"
-APP_VERSION = "1.2.2"  # single source of truth — read by setup_app.py & build_dmg.sh
+APP_VERSION = "1.2.3"  # single source of truth — read by setup_app.py & build_dmg.sh
 INPUT_CHAR_UUID = "7492866c-ec3e-4619-8258-32755ffcc0f9"
 
 # Nintendo company identifiers seen in BLE advertisements:
@@ -273,8 +273,10 @@ def set_dsu_enabled(self, enabled):
             with open(MAPPINGS_FILE) as f:
                 cfg = json.load(f)
         except Exception:
-            log.exception("could not read mappings.json to persist DSU toggle")
-            cfg = json.loads(json.dumps(self.DEFAULT))
+            # Never clobber a corrupt (but user-authored) file with defaults —
+            # the toggle just won't persist until the file is fixed.
+            log.exception("mappings.json unreadable, DSU toggle not persisted")
+            return
         dsu = cfg.get("dsu")
         if not isinstance(dsu, dict):
             dsu = cfg["dsu"] = {}
@@ -596,6 +598,10 @@ async def _connect_async(self):
                     streamed = await self._session(
                         address, name, reconnected=was_connected
                     )
+                    if not streamed and was_connected:
+                        # Still auto-retrying — keep the failure in the logs
+                        # only; a notification per attempt would spam the user.
+                        self.last_error = None
 
                 if self._stop_event.is_set():
                     return
@@ -791,7 +797,7 @@ def _apply_state(self, state):
         elif state == 'connected':
             self.title = "🟢"
             self._status_item.title = f"✓ {self.bridge.controller_name or 'Controller'}"
-            self._detail_item.title = f"   {self.bridge.packet_count} packets"
+            self._detail_item.title = f"   {self.bridge.packet_count} pkts"
             self._action_item.title = "Disconnect"
             self._action_item.set_callback(self._on_action)
         elif state == 'stopping':
diff --git a/tests/test_bridge.py b/tests/test_bridge.py
index 0a9d955..2e5e76a 100644
--- a/tests/test_bridge.py
+++ b/tests/test_bridge.py
@@ -308,6 +308,40 @@ class Named:
 a, n = asyncio.run(br7._find_controller())
 check("unrelated device ignored", a is None)
 
+# failing reconnect attempts must not spam last_error; only the final
+# give-up message surfaces
+print("== reconnect error spam ==")
+S2B.INITIAL_SCAN_WINDOW = 10.0
+S2B.RECONNECT_WINDOW = 2.0
+MockScanner.delay = 0.05
+MockScanner.queue = []
+MockScanner.result = {"AA:BB": (Dev(), Adv())}
+br8 = S2B.ControllerBridge(mm)
+br8.connect()
+time.sleep(0.6)
+check("spam test: connected", br8.is_connected)
+
+orig_connect = MockClient.connect
+async def _failing_connect(self):
+    raise RuntimeError("nope")
+MockClient.connect = _failing_connect
+MockClient.instances[-1]._connected = False  # unexpected drop
+time.sleep(1.2)  # several failing reconnect attempts happen here
+check("no error surfaced while retrying", br8.last_error is None, br8.last_error)
+time.sleep(2.5)  # past the (shrunk) reconnect window
+check("final give-up error surfaced",
+      br8.last_error and "reconnect" in br8.last_error.lower(), br8.last_error)
+check("spam test: thread ended", not br8._thread.is_alive())
+MockClient.connect = orig_connect
+
+# a corrupt mappings.json must never be clobbered by the DSU toggle
+print("== dsu toggle vs corrupt file ==")
+S2B.MAPPINGS_FILE.write_text("{broken json")
+m4 = S2B.Mappings()
+m4.set_dsu_enabled(False)
+check("corrupt file untouched", S2B.MAPPINGS_FILE.read_text() == "{broken json")
+check("in-memory toggle still applied", m4.dsu_enabled is False)
+
 print()
 if FAILURES:
     print(f"FAILED: {len(FAILURES)} -> {FAILURES}")