Now it vary rarely happens 🙂ĭont know your camera but my 100d doesn't have an internal battery as I know of that effects the problems you have experienced - but you live and learn 🙂 It was caused by 2 settings in my Canon 100d - one was NVR(and any other noise reduction settings in my 100d) which Gphoto2 (which indi uses) does(didn't) handle and Mirror Lock(Indi End) if I remember correctly. Had this with Indi DSLR/Gphoto (Canon) many times - I just removed the battery and then switch off camera AND then reboot RPI. I have removed the main battery, but I haven't a clue how long I will need to leave it to drain down, or if this may be any help at all! By the way, the camera seems to function quite normally when used in standard camera modes (P, AV, T, Auto etc) with shortish exposure times up to half a minute. One final 'cure' remains for me to test, to attempt to drain down the internal power source which maintains the date and time and camera optional settings. Has anyone encountered this before, and any good ideas for solving the issue? Since then I have tried various cures including changing power supply from mains adapter to battery and back, updating the camera firmware to the latest version, and changing SD cards, even though the images are not normally saved to the SD card. When eventually, after various steps of attempting to get it to carry on working, I went to turn off the power the screen showed an animated rotating image saying Recording.Remaining Images :1. After successfully recording five exposures of 300 seconds, at the end of the next imaging period of 300 seconds, the captured image was not downloaded to the RPi4 with the Indi driver indicating that there was an 'unknown error', and the camera display showing the number of remaining exposures on the SD card continuing to flash. A couple of nights ago, my camera started playing up.

Magic lantern canon 100d