OK, I know what the cause is now. It is third party batteries. I also have RAVPower batteries. I don't get this issue with the Canon battery. I believe the Canon charges the internal battery circuit, but the RAVPower does not. If I leave the Canon in...
I have the same issue. I have had my M6 Mkii about 3 years and hardly used it, I only use it as my second camera for holidays. It still looks brand new. It recently started resetting every time which is a real pain.
