My wallet mines nothing since several months (the V3).
I just report in case you might have a solution.
We have a fix actually being tested on ARM and Windows for the past week or so. Once that's proven itself stable and reliable, we'll push the commits to the main repo and rebuild the binaries for folks to download. Sorry for any certain frustration I'm sure this is givnig you. Do you have staking=1 in your wallet as well?