[Q] [Help] Screen flashes until phone crashes

Hi, I have a Galaxy Note GT-N7000. I bought it on feb 2012 and I never have this problem.
My problem is that the screen start flashing until the phone crashes and turns off. When I reset it the problem keeps going. I tried changing the ROM (I have been using oficial roms for almost a year) but never happend (I think that is a hardware problem). The problem is becoming more frecuently, now I have it at least once a day. The problem solves when I plug the phone to the AC.
Sorry for my poor english and I record a video so you can understood what I'm saying. When the phone crashes the screen gets freeze or turns off.


Thanks!