just use latest drivers but you should use nbminer much better , pheonix is a bit crap now dont support new rtx cards a lot of it is buggy plus the hashrate reporting is dubious on it too , they need whole new upgrade on it really used to be good but theres much better out there now.
Yea, I've see a lot of reports about those type cards and issues. Fortunately for me, I started mining years ago and got all AMD cards at a pretty good price back then and those were some of the first cards Phoenix supported. So it seems for those cards most all the bugs were eliminated a long time ago. For me I don't have any of the issues reported by other cards, and I don't plan on purchasing any more cards at this point.
Thanks for commenting..
What percent of rejected shares you have? Not percent that showed by miner. Just take all rejected shares and divide by all shares and multiply by 100.