I have a RX 5700 XT MIS Mech 8gb Windows 10.

It runs fine for 1-12 hours then cuts back to 47mh/s.  I have tried adjusting the clock/mem down with a starting hashrate from 57mh/s down to 52mh/s(almost stock).  1230-1340 clock and 1750-1896 mem, all do this reset to 47mh/s...

Any idea why this card would randomly cut back to 47mh/s or a way to diagnose it?  A restart of the software does not work I have to reboot the computer.  I have 2 RX 570 8gb running with they card at 31mh/s and they are not affected.

Thanks