Hasrate randomly keeps dropping to 0

Hi, my mining rig (hive os) can run fine for 10hours stable at 400mh. Then out off nowhere it stops mining. I have tried to activate the hasrate watchdog but it keeps going off all the time even when the hasrate is not dropping… Im pretty new in mining and

(first pic i also had some issues with a faulty gpu but you can see the sudden drops and hasrate watchdog barking)