Unplug and reconnect (with key on) and see if the problem clears up. The only thing I can think is that the buffer got a little sidetracked. When the key is shut off, the device is still running but the display goes to sleep. If there's something in the processor that has gotten confused, then it's still there when the unit wakes up. Unplugging the device does a cold reboot and should clear out any issues.
Let me know if this resolves the problem. If not, then we'll have to track down the issue. It's possible that the thermistor which controls the contrast is acting up, but tough to say. I just can't think of anything else that would change the contrast like that.
Keep us posted.
__________________
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