I searched and couldn't find an answer. Sometimes I'll keyboard lock my Pearl. It'll go dark, then 12-15 seconds later, lights up. It then goes dark and 12-15 seconds later, lights up again.
I tried standby (holding MUTE) and the same thing happens.
After a battery pull, all is well, but I'm not sure what's triggering that to happen. I don't think it's a light sensor thing; I covered up the LED (that's where the sensor is, right?) and it would still light up.