What I would suggest is downloading memtest ver 4.2 (I use the USB version) and test to see if the issue is with your ram or the motheboard slots.
Test each stick individually at xmp for at least 2 completed cycles.
Then take a stick that has passed and test each slot in the same way.
Once done, you can then add on stick at a time and run the test, till all the sticks are in system.
That will pretty much identify where the problem is from a ram perspective.
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You have not mentioned if you are overclocking your CPU at all and I wonder about that.
To help us help you - please provide as much information about your system and the problem as possible.