Mind Reading the second SS? Probb a memory leak in any of your scripts or your CMS, Can even be a server attack, EX: SYN flood if your server don't have that much ram AND don't have any timeout on your web server OR firewall rule in your server....
I got 8GB ram, proccesor quad 4x2,33 GHz
Sometimes with 50 players server crash :/
Can i set somes setup in firewall who will help me ?
I have 8 GB ram too, and when i made some tests (On lan, comparing my old firewall rules with my new ones) my computer ram goes from 3~4 gb ram usage to 9 GBS summing swap in some seconds, So you can try 'top', look at your process and wait till it crash so you can see what program is using that much ram and then ofc fix the problem.....
Ur server uses to much memory. Once it tops 2gb it crashes.