H510M-HDV-M.2 SE fan speed issue

Hello, I use new ASRock H510M-HDV-M.2 SE with two fans (ordinary 3-pin connectors), CPU and chassis, automatically controlled by the MB so when PC starts they are about 300-400 RPM. However, sometimes when the PC starts the chassis fan goes up to max 2000-2500 RPM, this happens 1 of 5-6 times.
I've tried to reset UEFI settings, redetect fans speeds in Fan-Tastic, however, the problem still occurs. Also sometimes the fan becomes quite after launching the Win10, but usually it just proceeds at max RPM so I need to restart the PC. Sometimes it launches quiet, but the RPM increases from 300-400 up to 500-600. Can't get the reason of this flaw.