Motor stops rotating during PreArm

Hello everybody !
I am using Cube Orange + Here3 firmware 4.3.2

Got this message
PreArm: Internal errors 0x400 l:234 cnstring_nan
after CompassMot calibration

I also noticed how one of the motors stops rotating during PreArm
1-2 times out of 10-15 attempts

Has anyone had this?
This problem occurs out of the blue and it’s confusing to me