I have an issue where the back light is turning off on some of the buttons after I upload. I can factory default and all lights come on. After upload, only the top two or three buttons are lit. Out of 10 keypads, this is happening on 8 of them. I originally programmed this system in 7.6. I believe that all was working at that point, but not absolutely positive. At my last visit, I upgraded to 8.2 and shortly thereafter the customer notified me of the issue. Any ideas as to what may be causing this?