Thanks Meter 18
Join Date: Feb 2012
Location: Thiruvananthapuram, Kerala
Most probably a hardware problem. Try using different ROMs, and if the issue persists, then definitely it is a hardware problem, and take your phone to a service center.
Phone: LG Optimus One P500... The best!
Current ROM: CM 10.1.0 RC (Got to say, the CM launcher and Apollo have become really good!)
CPU: 320-710 MHz, Interactive governor.
Kernel: Stock CM kernel.
Mods: Power as Search, Search as Power, Link2SD.
Some day, I'll give back to this community, what I got from it.