I'm getting high reject rates on my vega cards because nicehash is sporadically sending regular cryptonight to port 3363 rather than cryptonightv7.
Same for me on my Vega Cards.
it's on nicehash's end. they're sending cryptonight instead of cryptonightv7 on port 3363. and i predict that they'll blame it on the user's end rather than fix it on their end.

Same with my vegas. I've switched half of my vegas to direct mining and going to stop using nicehash at all. Nicehash should consider a better user support. But I think they don't give a fuck about it cause it's fucking cryptoanarchy)))