Yes i also think i could be a compatibility issue,after checking my system and running diagnostics everything turned out ok.Could be that my pc has reached its limits,but to be sure i will install WOW on my wife's pc to see what happens.She has a much better system than i have so i dont expect any problems.
I also checked my GPU and processor tempatures while playing and everything seemed fine.
thx Nokkeli and JapLance