I've noticed is SP Page Builder 4.0.6 have issue to save changes. I try to add Image Carousel - after that when change something in Item (i.e. title or image), when I click Apply, nothing is changed. Also, when I'm switching the tabs in Chrome it's taking a lot of time to re-open content with editor - whole page stay white for long time - but more often never get back then have to be refreshed, also getting very high CPU usage without memory usage.

Few times I saw a message when editing addons "Error Invalid addons settings! Contact with the Page Builder team.".

Dear Tofiq I guess you will ask for login details, but there is the same problem as in this topic: https://www.joomshaper.com/forum/question/18496

So I think you shouldn't waste time and ask your devs about this issue - finally alert "Error Invalid addons settings! Contact with the Page Builder team" was made by them :)