Unfortunately, there was an exploit discovered in SA-MP which somehow crashes servers. I am not sure how it works but it's obvious a lot of server have the same problem. The server seems to crash out of nowhere and it happens every time we restart it. To keep the nasty bots from joining, we will use a password for the server for now.
The password is lvp. No capitals, just 3 letters; lvp.
We hope we can remove this soon when this exploit gets fixed.
update: The problem has been resolved, the password has been removed.