

Ew. I hate that. I see they offer an option in settings to permanently switch out of S mode, but that seems like it’s a crappy excuse. I’m guessing most users are never going to go there, and will stay in S mode, using only Microsoft’s awful products. That’s their intention, at least.
(Not saying this was your case, but generally good to check) - a finicky/wobbly USB type c connector has been a symptom of a dirty charging port several times in the past. Awful lint/dirt would get packed down into it, preventing the charger from fully inserting.
I ended up carefully and gently picking it out, though there are some delicate small contacts in there!
Anyway, good luck trying GrapheneOS! It’s been my daily driver for months and past the learning experience it’s great!