WoW Error problem

So let me explain what is going on first...2 days ago,while i was playing my character,exploring for achivments, "WoW Error" popped up,so i thought "it happens sometimes,its not a big deal" but as soon as i logged in again, it happened again,and it kept popping over and over, so i reseted my computer and it "stopped" and 10 minutes later i quit the game. Tomorrow after that, i logged in,and again, "WoW Error" popped. By this moment i was already pissed,so i asked in guild,and they told me to delete "Cache" and "WTF" folder,so i did,and errors really stopped for maybe 30 minutes,and after that popped again. And its not due to some mob or area that can cause error because in that 30 minutes i was moving,and even joined icc group. And today,when i got home,i logged in to wait in queue and again.."WoW Error".. I'm not sure how to fix this,and people on forums told me to contact staff,so thats what I'm doing right now. Do you know how can i fix this? Thanks in advance!