Question [Q] Constant Freeze starting with a buzzing sound

Hello ...

My AT&T HTC One X+ has just started to freeze up constantly and it seems to start with a short buzzing sound.

When it does this the screen/phone gets frozen and hot to touch with the display showing some white horizontal/vertical lines. If I had to guess I would say there is a short somewhere in the device but I have no idea where to start.

The phone was stock with latest official AT&T ROM when this started and now I have unlocked and loaded a custom ROM on it and it seems to have the same issue (Eelegancia 6.2.0).

Anybody pointers?
Thank you in advanced ...