[SWG] SWG can't work, Console Display "Out of Memory" issue.

SWG: Block + Proxy Function

Some one day, SWG can't work. Ping managerment and lan port failed.

Console display "Out of Memory : killed process 31400 (tcheartbeat)" or "Out of Memory: Killed process 3312 (sslProxy)".

I know this is linux start OOM killer.

How can fix it issue?

Console Display Screen:

Thanks