[Q] What is going on? Soft bricked?

Hi,
My galaxy note was rooted and flashed omni 4.4.2. Its work very nice and smooth, but now after 2or 3 weeks when i was playing games, my Galaxy note suddenly dead and cant boot into system.
I was tried to flash the rom again, factory reset, wipe all the things and reflash the omni rom, it works.
But when it boot into the system, at the language chosing interface, my phone was dead again.
Anyone know what is going on? Help!
Thanks