Invisible 'boxes'

On my friend’s TTT server, weird things have started happening. Specifically, randomly, a player gets a ‘box’ around them which isolates them from the game. It stops him from being hit and shooting others.
I have no idea why that keeps happening.

I can send a demo file in a couple of hours to show what exactly is happening.

It basically acts as a block the player is in, it’s invisible and you can’t shoot through it

So the player cannot shoot out of this box nor can people shoot him?
Have you checked all the .lua files you have edited, maybe you forgot to end a function or something?

No, I haven’t checked. I’ll look into it

There is no errors or anything at all. Just, very rarely, those boxes appear and cause problems.