Replacing cpu Thermal paste triggered the AppleThunderboltNHI.kext problem?

Question

This is a Macbook pro 2014-mid 15 inch.
After I replaced the cpu thermal paste, it starts to auto shutdown frequently. I have monitored the cpu temperature to find out that it is better than before.
When it is connect to a monitor through thunderbolt cable, it works normally.
There was no such auto-shutdown problem before that. I googled to get the clue about AppleThunderboltNHI.kext.
I tried to disable the kext, the problem disappeared. But I need Thunderbolt-Network-Adapter.
And I wondering what happened, why the problem came out after replacing thermal paste.

Answer 1

I do not know what really happened, the problem disappeared. What I did is that I used a paper to clean up the dusts around the three FDMF6808 chips.