Question Cpu started randomly heating up from 30 till it slowly rises to about 70c then shuts off (idle)

Sep 3, 2021
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Ryzen 7 5800x
3070
B450m hdv
I got my ryzen 7 about a month ago and bought a liquid cooling (Icue 100i elite) whenever I boot up my PC the CPU temperature slowly starts to rise and the fans go crazy i’ve tried replying thermal paste, making sure the cooler is seated on correctly I’ve tried a bunch and nothing seems to work I can’t even use PC can someone give me some ideas that might work
 

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