diff --git a/tui/src/birdcage_tui/screens/signal.py b/tui/src/birdcage_tui/screens/signal.py
index 1a5ab17..591db54 100644
--- a/tui/src/birdcage_tui/screens/signal.py
+++ b/tui/src/birdcage_tui/screens/signal.py
@@ -447,15 +447,17 @@ class SignalScreen(Container):
                         "Firmware sweep failed, falling back to software",
                         exc_info=True,
                     )
-                    self.app.call_from_thread(
-                        self._set_sweep_status,
-                        "Firmware sweep failed -- falling back...",
-                    )
+                    with contextlib.suppress(Exception):
+                        self.app.call_from_thread(
+                            self._set_sweep_status,
+                            "Firmware sweep failed -- falling back...",
+                        )
 
             self._do_sweep_software(device)
         finally:
             self._sweeping = False
-            self.app.call_from_thread(self._reset_sweep_buttons)
+            with contextlib.suppress(Exception):
+                self.app.call_from_thread(self._reset_sweep_buttons)
 
     def _do_sweep_firmware(self, device: DeviceLike) -> None:
         """Firmware-accelerated sweep via azscanwxp (runs in worker thread)."""
@@ -674,7 +676,8 @@ class SignalScreen(Container):
             self._do_scan_inner(device)
         finally:
             self._scanning = False
-            self.app.call_from_thread(self._reset_scan_buttons)
+            with contextlib.suppress(Exception):
+                self.app.call_from_thread(self._reset_scan_buttons)
 
     def _do_scan_inner(self, device: DeviceLike) -> None:
         """Inner scan logic (called from _do_scan worker thread)."""