Actually, this series of cameras is notorious for the camera rocker switch, regardless of if you shot in a clean room with hard drives or a rodeo. its the only thing i hate about Canon!
I can confirm, the issue is likely the battery. I teach HS photography and have about a dozen r100's. They are awesome cameras! I came across this error today for the first time in 2 years. The issue seems to have stemmed from charging the Canon ba...