I first noticed a problem when i got into my car and the radar was beeping and the LCD said Service Required. I unplugged the unit and it worked fine for 1 week. Then it said it Manual Calibration. I did a master reset by pushing all 3 buttons and it seemed to work for 2 mths. Now it keeps saying Manual Calibration. What do you think the problem may be? I have the Escort Passport 8500 X50. My Email is Matt350zl@gmail.com
Thanks so much for the help.