Random crashes

Heya, I've been playing in this server in a little over a week but every time I play there's some problems when I'm grinding or just doing something in general but mostly when i'm killing mobs. The game crashes on me more often than I can grind for 30 minutes.

I don't know if this helps but, I've noticed some things before this happens:
-the game loses it's audio (everything and anything)
-the game screen suddenly hangs
-the game goes black

after either one or all of these symptoms show, a minute later the game crashes on itself and I'm left relogging in and everything before being able to play again.

My problems seems to only show when killing mobs, but it has sometimes shown when I'm doing nothing.
Looking for a fast remedy for this. Thanks in advance~!