I've over clocked many CPUs including two recently. One was an i7-5820k the other a 5930k. I did the 5930k first. It was stable all day at 4.5 unless I pushed the bclk. Until I tried lowering the voltage, then I could get a little more out of it. Once I established the limit, I dropped the multiplier down 1 and the mhz down 1.25 so as to not over stress the cpu. Then when I did the nearly identical 5820k, I found I could go to a higher blck and a higher mhz, but the system required a higher voltage than the 5930 could handle. Also the 5820 would overheat (thermal) if the ambient temps went up or if the case was open. So in the end I had to settle for less from this chip even though it seemed to be the more capable overclocker.
The silicon lottery is a fickle thing. It seldom pays to settle on a fixed goal and you must hit that. It is entirely possible you'd have fewer problems at 3.9. Chasing the very last mhz is not worth it. The difference will be trivial in performance and the difference in stability can be quite a lot.
actual advice:
I think it is an OC issue.
If you are running a bus speed over default, try going back to default on that.
How are your temps after running aida64 for a while?? If they are ok, maybe try a slightly higher voltage or a slightly lower one for that matter.
I would also hazard that with a slight reduction in the multiplier, you could get a more stable system.
Find a spot where is behaves as it should and then try to see what it takes to move it from perfectly stable (including the useful ability to boot) and then fiddle more with the settings. Do not run it at the absolute max it can go unless all you care about are bragging rights.
Also:
You should run with your case sides on as it helps cool other components like the VRMs.
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