General :: Bootloop / Launcher Process Has Stopped

I have bought chinese android tablet last month.

Boxchip cougar a10c,similiar as mid/player momo tablet

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It's came with android ice cream sandwich 4.0.1+rooted+unlock bootloader Working flawlessly until i installed task killer app.

I used it,and after several times i killed app,suddenly there is pop up notification came.("Unfortunately Launcher/Market/Gmail/Emulator,and many else has stopped")

I reboot the tablet,but when it turn on,it is just bootloop.I reset again,and it doesnt appear anything on the screen unless the black screen only (with sometime light flashing from the screen).

Then i flashed and format it to gingerbread (2.3.4) rom from their official web And yes,it is work and finally i can boot into home screen and do any else.

But after several time turning off and on,the problem came back again (bootloop and black screen) but somehow i manage to go to recovery mode and do factory reset+wipe data and cache,but it's useless.

I flashed it again with the same rom,and it's start working.And goes..after a while..the problem back again.

I choose to flash back to ice cream sandwich.When i turn on,then goes the same first problem at the begining ("Unfortunately Launcher/Market/Gmail/Emulator,and many else has stopped").

I reset again then new problem came out.

( Encryption Unsuccessful - Reset Android)

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Rather than use that guide,i choose to flash to gingerbread rom.Then it's fine,until..you know,reboot the device and back again to bootloop.

Is it because the task killer app?Or it is hardware failure?or maybe there is some file that has been deleted/terminated?