mumbo6868 no I'm not that deep into the topic, and I'm no GOS dev or versed in programming at all. Just intuitively trying to find solutions here.
Noe since it's most likely about the battery restriction setting, you fortunately have a solution at hand. Maybe a dev could have a look into this to see whether that's a bug. I've heard that the 6a specifically comes with overheating issues, so it might be expected behavior for this device...