Hero Problem..

[mangosteen]

I played many server before and even Owned one,and this never hapened to me it's only happen in this server here what happen

I first log in and choose a char an after 5-15 min of playing my PC Freeze and i have to reset the computer..it does that everytime i play for like 5-15 min on heRO..i tested 2 other server and its fine so i have no idea why it's happen but if anyone can give me an answer thanks!