I had the same problem with mine randomly switching off and support weren’t very helpful at all (they asked me a few questions then just vanished!). Mine also had similarly strange battery charge issues. It wouldn’t fully charge and would show charge levels that didn’t make sense, like it somehow having more juice after being used, or fully charging after just a few seconds plugged in (actually it’s rather reminiscent of my OP-1 in that regard). Someone on here suggested I take the battery out for 30 seconds, then put it back in to reset something (not sure what), so I did that. And I also swapped the power supply I was using. I was using an Anker one and it would never charge to the top, but when I used my Apple one (from my ipad) it would fully charge - I have no idea what the difference between the two was but one worked and one didn’t properly.
Anyway, since taking the battery out and changing the charger it seems to be behaving itself. I’m not sure which of those two things fixed it, or if either did since I also updated the Firmware at the same time and my issue may have been fixed by that, but it’s worth giving them a try.
Good luck and I hope you get it working properly.