The known stable/working version is 3.3.8 so you must choose this version but before you downgrade make sure you have a backup seed/wallet.
That version stop working for me, if I remember correctly it was some network error. That's why I upgrade to new ver.
Thing is that few addresses that I previously saved always shown with labeled by names I saved them on the transaction list. But I can't access that list of my saved addresses, instead I must put them manually by copying them from TX list and paste it when I'm sending.
Anyway I have already gotten use to it.