Make sure your router is well ventilated. I used to have my modem and my router sitting on top of each other, and it melted one of them (I forget which one got took the most damage) and I had constant DC's.. Once something like that happens, its just time to replace the part. Its nothing you are going to fix.
Do you know what "nemesis" means? A righteous infliction of retribution manifested by an appropriate agent. Personified in this case by an 'orrible cunt... me.