Question aio heat problems

Aug 10, 2020
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my aio on startup will climb up to about 75C or so and stay there if not climb higher making my computer shut down due to overheating, but when i start up my pc if i lightly flick the tubes of my cooler it instantly drops the temp to ~55C. is this a clog? or maybe a sensor is blown out?

Edit: i have tried multiple reapplications of thermal paste of varying amounts , and this is still a consistent problem.
 

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