Ok, So now I have had my 536 for over 2 months. I run it 24/7 at home and have not had any of the mentioned problems like back light and clock. I leave it on all the time and just turn the volume down at night. I recently took it on a road trip to San Diego with the GPS unit installed and was impressed. I set only LAW services and full database, range to zero and it did the rest. Very Impressive! I'm still happy with my 536, Uniden and Upman.