So I have this peculiar problem in that when using navigation after a while (say 30 minutes) the backlight completely turns off. For a while I actually thought the screen was off until I realized that the screen was on, just 0 backlight. When I remove the phone from the dock, the light turns on again (the only way to get the backlight back) but once I reinsert it into the dock, it lasts a couple minutes before turning off again. My initial hypothesis is that it is heat related (since it is charging while running navigation in the sun) and removing from the dock takes out the charging aspect, but I wanted to see if anyone has come across this before I go into more testing.
I have had this issue on different roms/kernels