Thread: BIG problem! Blackscreen after a short time ! all the time! :S

hey, i have a BIG problem with my private server!
im running a source on a linux and all is working... but some minutes (sometimes 10minutes, sometimes 1hour)all players get a BLACK SCREEN if they log in or even if they're in game, but the server doesnt show an error message..(u still see the chat box at the bottom and u can chat there..)
and i need to restart server and then its working again.. but after a few mins , sometimes after a hour (it changes everytime) the black screen comes back and i dont know the problem im not so good in java
and i loose all my players
so i wanna ask a java coder for help!! please, does somebody know the problem?!