Thanks button pressed OP. No 3 seems to have done the trick. Incidently, if it is static build up, then wouldn't charging the phone on a metallic earthed surface help. ie a computer tower or something? This is where mines just sat for the last 4hrs charging off my tower until I found my old desire charger. Anyway, all seems cool now wierd though.
This (charging on a metallic) surface (ie my laptop) was EXACTLY the solution that worked for me, that i posted on here some time ago. I can pretty much reproduce the symptoms at will. Charge on wood for a day or 2 it comes back, back onto the metal, gone.