I can't use Phoenix 4.8c/Claymore 15 with 441.87 at all, it will crash before hashing on Phoenix sometimes, and in Claymore after about two/three rounds; removed all overclocks and the same.
Pissed me off cuz I'm stable for days on Equihash192,7 and Neoscrypt (much hotter algos)
i am sure downgrading the drivers will fix the issue
but i want to say that when i was mining and had amd rigs
i always installed blockchain drivers and nothing else
never updated from it
and disabled nearly all kind of windows updates
sometimes when we update to a new software version
something or the other always breaks