Bottom row of button lit when screen is off

[Billone]

The other day I noticed that the bottom 3 buttons ( back, windows an search ) were lit up even though my screen was off. I turned on the screen and turned it off and the buttons stayed lit. I powered downed and powered up and the problem seems to be gone. I've had the Titan for over a year and I've never seen this before.

I wondered if anyone has seen this before. Is my Titan starting to break down?

 

[palandri]

I've actually seen that happen on my wife's Nokia 808, a power down and restart fixed it. She's had a few updates since then and it hasn't happened again. I suppose some code gets stuck or errors.