Hi, has anyone experienced problems with the on-board flash. I have an EOS-5 and when I switch it to flash, it pops up, then on pressing the shutter, the shutter opens but then the camera freezes. The battery indicator shows flat and I have to disconnect the battery to reset the the camera. The battery is new and once reset it shows to be fully charged. Other than that the camera works and behaves perfectly. Any ideas or information most welcome. Dai.