Have the camera carry strap lugs fallen off on your Panasonic Lumix DMC-G1 or DMC-GH1. Depending on when your camera was manufactured, some models have a nut or a screw which secures the strap holders. The nut/screw becomes loose due to vibrations and falls off inside the camera. This could possibly cause a short circuit on the camera PCB's and cause further problems with your camera. Switch the camera off, remove the battery, remove the lens and shake the camera. You should hear the nut/screw rattle around inside. This can be repaired at a cost of £44.95 including VAT and return postage.