i am having a very bizzare issue i got the R9 380 v2 nitro dual 4 gb edition which is oc'ed. The thing is that it is clocked at 1010 by default when i run heaven bench benchmark sometimes it will crush either freezing completely or restarting the driver and clocking it down to 999 Mhz , Should i use my warranty? and return the product or am i missing something???