BEL 890 Radar Detector "markers" Questions

Beltronics 890 Problem The unit goes into a constant alarm mode and flashes: ?L03, then flashes: ?MARKERS. I turn it off and on - then it works ok. What gives and how do you make it stop doing this? I

Vector 940 works for a moment, then flashes ?L03 CAL ?MARKERS Bell Vector 940 was working great, then started flashing ?L03 CAL 6 times, then ?MARKERS 6 times. Call Bell Tech support and they ...