So, this issue has been plaguing me for the past week at least. Started manifesting itself during dungeons. Thought it might be overwolf. Problem actually got worse.

Saw this in another thread on here, but someone mentioned overclocked RAM. I've only had the issue since upgrading my PC components. Went into BIOS, reset my CPU overclock, RAM overclock, and set MSI afterburner to default - happy to say no problems so far.