Crashing server

I have a server and it crashes every two seconds and I don’t know what to do because sometimes it’s fine and sometimes no one can join for hours at a time. I think it’s under attack from a hacker but it could be the server itself. Restarting the server from the owner portal does nothing, unfortunately. Can I have some help, please?

What is the name of your server? Maybe I could join it myself and see if the issue isn’t just on your end.

I already know it’s not just on my end because it kicks the entire server but it’s called Knock Knock (sometimes it’s fine and sometimes it isn’t which is why i suspect a hacker)

Try whitelisting temporarily or checking to see if the same unknown player joins when it happens