Integration author here. 
You’re not alone: this is happening across the board. As best I can tell, their unofficial Cloud API is pretty flaky as of late: it’s not unusual for me to see multiple 5xx entries (which indicate a server error) in the logs on any given day.
Seems like there may have been an outage recently? https://reddit.com/r/simplisafe/comments/kbn1r5/simplisafe_outage/
Curious if you’ve updated to 2020.12.0 yet? I’ve put in some defensive code that may help.