full crash and can't play ! Refund

Hi,

After playing this superb game for 1 month and testing several classes, I started to encounter the big freezes that many encounter, especially since the Comet/Fireball/Minion build. The game became unplayable after trying all possible resolutions, 1 heart then 2 hearts less, multith off, fullscreen, with one hand and one eye etc....
can you fix bug an frezze? or refund?

THANKS