Plug [Q] A500 Lag During Charging

Hello all, I have 1 issue with my A500. Only during charger plug in, my tab become super lag. This problem started when I doing overclock using flexreaper extreme.

Tried to flash new kernel from eztery, upgrade bootloader to v8, and flash lightspeed ics rom. None of these works as I still have this problem. Even on recovery screen, my tab is not responsive when charger plugged in.

I don't know what caused this. Is anyone having the same problem? Please help.