i had this happening since the longest when i acquired the beta....
(when it was leaked both x86 and x64...)
for some reason i never thought of this before since the first thing i did is disable the CEIP after the second reinstall (for another reason to see if it disabled the WMP CEIP (? is that how its called) and so far so good it was gone.... at that time....) ( i thought it was those ramdom time when you get errors that are fixed with a reinstall....)
so i tried a install of the beta (from MS servers) and lo and behold and there it was again....
never thought it was that though...lol