I tested it by installing amd driver 19.4.3 and after that Claymore driver ("Ethdcrminer64 -driver install") as an admin on cmd prompt then added "-strap 1" to end of bat file. I did over- and underclocking in AB. (RX4?0) . Worked perfectly.
What is your WIN10 version? (updates)
What RAM mem type do you have? and what Mh/s are you getting out?