What are we still happy with phoenixminer 2.9.e the stale shares are back again, while it was with the 2.9 .d away the joy is so short-lived unfortunately.
I am going to guess its your system, I have less stale shares as well as fewer incorrect ones being generated. I will say its been only around 7 hrs so far. What cards and drivers are you running?
Indeed the system, try re-installing your drivers.
I've been updating as the releases come out since 2.7c and to date 2.9d & 2.9e seem to stay under 0.10% in my case.
I'm using rx580 4 & 8Gb, one click patch, OC/UV done via Phoenix settings and running latest Adrenalin 18.2.3 feb 22.
Hope this helps, good luck.