Due to a huge internet autage here (36h out), I had to use the hotspot almost permanently during that time However, after some time (varying from minutes to 1-2 hours) the connection dropped and the phone was unresponsive. I had to reset it every time with the 3 finger salute. (power + both volume keys for a reset). It lasted longer with only 1 device active using the hotspot, multiple devices shortened the availability a lot.
I already noticed before that the micro SD is always corrupted when the phone powers up (I prefer to power down the phone when I swap cards). The only way to get the card detected again is to remove it with the phone on, fsck the card on a computer and then fit it ‘hot’, as Android’s only solution is to format the card (why Android not just fsck the the thing has been a mistery for ages).