ADD: There were lot of calls to enable tracing, but very few to turn it of afterwards in the methods.

Don't know if it has some influence but can't hurt calling  "set_tracing(FALSE);"  when method returns.

client/cmdmain.c

@@ -204,9 +204,10 @@ void UsbCommandReceived(UsbCommand *UC)
 			return;
 		} break;
 
-		default:
-	storeCommand(UC);
+		default: {
+			storeCommand(UC);
 			break;
+		}
 	}
 
 }