I have the exact same issue with Rx 460 windforce 4gb
After the update the card keeps in idle mode even through gaming, it makes gaming inpossible because the card is underclocked so games only show 10 to 15 fps please fix this. Even trying to overclock the card but the card wont accept it!. It keeps idling en crashing.
sry for my bad english:
if you use Afterburner, reset the settings to default, deinstall AB and do a cleaninstall of the drivers.