It's a genuine concern and i'm not sure why people are jumping on OP for it. After i saw that smoking Xbox SX (fake or not), i've been making sure to turn my Xbox fully off and not leaving it in quick resume mode because i noticed the fan still spinning. It's supposed to do that but it just made me feel uncomfortable knowing power was running through it while i'm asleep in my bed right next to it.
If you buy a £450 new piece of tech, you want it to just work regardless of an "acceptable failure rate out of x amount of consoles sold". That said, the amount of weird issues popping up with the PS5 is strange. If it was just a case of a console shutting down and bricking, fair enough because it would seems like a single isolated issue, but i've seen disc drive problems, failing GPU problems, external HDD bricking them, rest mode bricking them... It's odd.
Just make sure you have a warranty in place but shit i'd be mad if my new Xbox just bricked a couple days after getting it. I know consoles fail sometimes, but come on, people are excited and have waited years for them to have it break a day in would just be disheartning. The wait for a replacement would be agonizing.