any one can help me?

[kim8857]

[serverpack: aion lightning 3.9 pack]

[loginserver console]
info [main]: game time saved...

[gameserver console ]
info [main]: Gameserver #110 [PID=668] died, closing.
pingpongthread - execution time 423422msec

After 30~50 minutes a game is disconnected.

server down

How do you solve? help me, please.

[MentaL]