[SOLVED] CPU Fan turning off after a while

Jan 5, 2019
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Hey Guys,

since a few days my CPU fan is turning off after a while.
I connected my Scythe Big Shuriken 2 Rev. B to my Gigabyte A370-DSP3 board with the CPU_FAN, after like half an hour its turning off and the CPU overheats.
I thought the cooler is broken and tried it on the SYS_FAN. On this connector its the same, its working for like half an hour and then its turing off.
I thought its a problem in the BIOS or something, so i just connected a 2nd CPU fan to the board. The 2nd fan is working all time long, no matter how long i let the PC work.

I thought about things like Thermal Compounds or maybe a software problem, but generally the software shouldnt be the problem, cause its working with the 2nd fan.

Any ideas what to do?