@ernolf thanks for your assistance 
the issue @cmscotti is experiencing is a typical 3rd party app upgrade issue as I’ve seen over the last 8 years of snap-support described here: How to manage failed automatic update in Nextcloud snap
but as long as users do not run the debugging script and post the result here, it’s a guessing game!
I’ve explained what information is required to help, but I’m not prepared to start guessing!