Based on recent reports it is quite clear that their is currently an engine bug. The anti-cheat system seems to be randomly terminating people. I believe this occurs when players join the game as it seems to be triggering as if a player is exploiting.
The Roblox Unofficial Discord server has released an announcement advising players not to join whilst this situation is around. I am more than sure that the engineers are activley working on this bug.
The main advice around this bug currently is to not join any games at this moment in time. I am sure that actions invoked towards players will be undone soon.
I hope this, or this is there way of handling there server issues as ROBLOX’s Platform has had some issues in the past couple of days, and they are getting server overload. And this is the way they are getting people off there platform.
I do, I have never exploited on the ROBLOX platform on my account that got banned, I rarely even go on that account and its just for development testing. It somehow got banned for the reason: