I've never had that issue with my G9. Try letting the battery run down entirely to see if that resets it.
I've read online that others have done that and it worked so that's what I'm doing now.
Others have taken them apart and removed the battery and that worked as well. I'd do the same but I'd need the worlds smallest torx to do it!

Was hoping someone else has had this experience and discovered a quick fix.
Thanks Kevin.