Ok but I've got the same issues with my old wallet which was working fine almost year and than after some update it started problems.
Aftter few weeks staking was stopped just like that.
After that there was problems with wrong coins balance, with sync after update, and wallet was regulary off because of some system error.
That's why I moved my coins and made brand new wallet with latest version and it was working good few weeks and than after last update problems are started again...