C12.0.52 taking a Looooooooong time to close on medium size projects

Working on a new project in 52 and getting on pretty well with H7 , Ga5se and audio , come to the end of the session and go to close Cubase ,save /close via the menu and then Cubase just hung .
I remember a few days ago someone on a FB group mentioned about Nuendo taking a long time to release the memory, soooooooo instead of force closing Cubase thinking it had crashed on exit , i left it for approx 2 mins and it closed . I reopened Cubase again and it had certainly closed down properly .
So it looks like there could be a common issue with Cuendo . Anyone else having this issue ?