I am having an issue with my i7-7700K Kaby Lake 4.2 GHz overheating on 2 of the 4 cores. What happens is 2 cores run stable at overclock between 45 and 65c depending on load. The other 2 will jump between 45c up to 90c. They stay at 90c for about 15 seconds then drop then go back up. They never stabilize no matter what I try. I have ran the fans/pump up to 100% and verified all software is up to date. I am liquid cooling with the corsair H100i. I should mention I have also cleaned and reapply thermopaste.The motherboard that I am using is an MSI Z-270. Any ideas?