Difficulty with 12.0.30 - go back to prev version?

Just installed this now Cubase is total not usable for me. completely locks up after 5 min. and never got the blank side on plugins which this claims to have fixed and now I do get that problem?
I have not completed 1 single song on 12 yet this is most trouble I have ever had with software and the most money I spent? so disappointed
version 11 worked well for me but i love the new remote feature’s and the chord track improvents if only I could use it