We use Intel box fan and AMA CPU coolar to do the test, but we cannot see the symptom.
OS: Windows 7 64bit
AXTU version: 0.1.56
Please kindly refer to below suggestions for testing.
1. Check whether your AXTU version is 0.1.56 or not.
If not, please kindly download the AXTU from below link and then try again.
Link: ASRock > Products > Motherboard > H61M/U3S3 > Download
2. Check the pin of CPU fan is connected to CPU_FAN1 connecter.
3. If possible, please kindly change another CPU fan to check whether the symptom still occur.
Have a nice day
ASRock TSD Emily