I'm not an expert but i believe the problem your having might be your computer restricting the usage on the process. Your computer or internet might be thinking its using too much memory because at spots the person who made the repack packed in stuff very tightly. Malls are an example where you have about 30 venders and about 12 big npcs around it which can be reduced easily.. Try starting your wow then hit atl + ctrl + del and go to processes and find wow.exe and set that to a high priority. This will allow it to use more CPU which might prevent a crash. Im not 100% sure this will work but its worth a shot. It might be the repack for you..