Software or hardware charging issue?

view full story

http://forum.xda-developers.com – I have a weird charging problem. I use perseus kernel alpha 26 and ultima ROM. Sometimes when the phone is fully charged (and still connected to the wall charger) i can hear the distinct sound like i just plugged in the phone and the screen wakes up. It does this randomly every 5-10 minutes, but only after 100% battery level. Does it have to do with kernel/Rom or is it a faulty hardware? (HowTos)