Attempt to fix truncated MVR files

src/np_workflows/shared/base_experiments.py

@@ -218,11 +218,14 @@ def stop_recording_after_stim_finished(self,
             stims = self.stims
         while not all(_.is_ready_to_start() for _ in stims):
             time.sleep(5)
+        is_first_mvr_file = True
         for stoppable in (_ for _ in recorders if isinstance(_, Stoppable)):
+            if is_first_mvr_file and 'mvr' in stoppable.__name__.lower():
+                sleep_s = 4
+                time.sleep(sleep_s)
+                logger.warning(f'Waiting additional {sleep_s} s for MVR to finish writing...')
+                is_first_mvr_file = False
             stoppable.stop()
-            if 'mvr' in stoppable.__class__.__name__.lower():
-                time.sleep(v := 3)
-                logger.info(f'Waiting additional {v}s for MVR to finish writing...')
 
     def start_services(self, *services: Service) -> None:
         if not services: