I went for a walk yesterday, and was listening to music the whole time, and when I got home I couldn't get the screen to turn on.
Music was still playing but the screen was completely black and unlit the whole time.
Anyone has has this issue ?
Exactly what Bruce said. The device would reset after about 10 seconds, and the screen should come on almost right after that. Otherwise, you've got a big software bug or a serious hardware problem, which might not be easy to fix.