@kemonine Yeah, that’s not good.
I’ve been able to fix a couple of Samsung devices that did that by replacing the batteries. I’m not a big fan of prying open non-user-serviceable cases, but I’m starting to get used to it. 😃
I imagine the 6P is similar to the 5X, which I had until it just flat out died and wouldn’t start up. I considered replacing the battery on that, but it was already >2 years old, and it wouldn’t start up even with external power in & the battery disconnected.