Just a short notice from a sysadmin here: if your fs is going into read-only, your SD storing the os may be broken. This switch to read-only happens typically, when a filesystem call fails. Please watch dmesg in that case, as it still logs to ram. If there are errors during reads or writes consider replacing the card.
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No it’s rarely if at all about broken SD. On openHABian/RPi, /var/log is on ZRAM, and when that’s full, it turns read-only, which is what happened here.
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Okay, this is a detail i did not know - sorry for the confusion from my side.