I didn't have this problem with either my i5 SY or my i7 KY.
Remembering that standard RAM is used by the Intel graphics solution, something to try would be to test your memory with MemTest86+ or something similar to see if you potentially have some bad RAM. I might also suggest that you set both the graphics memory size and aperture size to 512MB.
Hope this helps,
Thanks for the suggestions, I changed the settings you mentioned and at first it seemed to solve the problem, but it returned after a restart.
I ran MemTest overnight without any errors, so I played around with the graphics settings a little more and found that a memory size of 1GB and an aperture of 512MB seems to work.
Thank you for your help!