I managed to find my firmware. I think the issue was it wasn't connected to WiFi but I have managed to do that now. Says I am on 23.8.2 and that is up to date (went into settings and forced a firmware update check and it said no updates available)
Still seeing the "stopped charging" notufication. I've noticed the car will keep charging to 80% but if I am in the Tesla app I can see that according to the app the charging does actually stop briefly then resume by itself. Not a major issue as the car will keep charging. Just a pain to get 3 or 4 notifications each time I charge saying it has stopped.