It would require, more information about this issue.

Saying server "when i go to a bit far at nether it goes crash." it is not giving any hint where would come from this error.

Server side there is no insight of what would cause the server to crash, there is on our side No CrashReport, or anything pointing toward a crash since last log line on "crash" that lead to a reboot is nothing more than the last thing done on server not even an error. (i.e. Chat Log, memory reload, connection disconnection.)