I have two Uniden SDS 200 scanners. On one, the numerical keypad and the 3 sofkeys just randomly stopped working. Even when I connected a micro USB cable, pressing the E key when prompted to enter usb mass storage mode had no effect and it timed out returning to scanning. I was forced to do a full memory clear by holding the 2, 9, and center softkey while turning the scanner on and the keypad did respond while doing this. The keypad did then begin working and I was able to enter usb mass storage mode a rewrite my favorites list. However after a day, the keypad had now stopped working again. Any ideas?