Game closes for no reason

Hello guys.

Starded playing L2 yesterday. I have really embarassing problem. My game closes for no reason even in the middle of fight every 5-15 mins. Tired to launch the game again and again.

No laptop lags, no internet lags, no electricity problems. Nothing at all. I even dont get any errors when this closing-game thing happens, so I dont know where to look, what the problem is.

I use firefox for launching the game. Everything else is closed. Windows 7, laptop is ~6 years old (bcs summer and its quite hot inside, playing at lowest graphical settings to avoid heating).

Tried this game on my brand new pc (windows 8) using firefox and dont get this problem.

So, maybe its because of windows?

 

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