why do i keep dying every time i go into the mouse hole?

This bug has been reported in different threads already.
I suspect a problem with the automatic hack prevention. If the problem persists, can you please type "/ips" in the chat and tell us what the numbers say or take a screenshot?

If you enter before passing 5 seconds in the maps, then you'll die.
But other players are having this problem as well, and the admins are trying to know what's causing this.

I understood from some people in game that relogging or even changing rooms may temporarily fix the issue. Have you tried this? Please let us know if this helped.