GF1 will not turn of

My GF1 will all of a sudden not turn off, or to be correct it turns off and then immediately turns back on. The on/off button sometimes does not work at all, and when it does, the camera turns back on as stated. It happens regardless whether I attach my 20 mm or 14/45 mm lens. The camera has firmware 1.2 and the lenses are also up to date.
Any ideas?
Cheers Jacob