That is odd. Alright, let’s try this next: power off the panel. Settings > Advanced Settings > Power Down.
Leave it off for 1 hour, then boot it back up. Any change? If not I think a factory reset may be needed.
The Master Reset option is found using the dealer code (default 2222) and shown on page 38 of the manual.
It is possible that your local cellular towers for the network provider are having an issue right now and activation signals are having trouble going through. I do not see any wide reports of that though at this time.
EDIT 11/10/2023: Trouble reconnecting to the cell network was addressed in firmware 4.4.1, which should be applied if you are having connectivity issues. Steps to update are found here.