AIO liquid cooler failure

If you use an AIO cooling system in your PC you be unaware that it may need servicing every now and again. In my PC I have installed the Be quiet! AIO silent loop cooling system

My PC decided to shutdown due to CPU going to 80C. After I restarted the PC I checked the CPU temp and sure enough it was going high again very quickly.

Just to be sure it was not some app going crazy I tested directly from the BIOS, as you can see all the temps in there. The BIOS view was also showing high CPU temp in there. When in the BIOS use SMART FAN 5 App to check temps. The screenshot you see was done in 2017 so this AIO is still going strong.

Be quiet! AIO cooling system, Silent Loop, Silent Loop 2, Be quiet silent loop water cooler failure, All in one liquid cooler