This is still happening in my case. Once in a while. In my case the screen whites out for some seconds and then the page content is frozen(as if the top fold of the page is pinned down, cant scroll below, cant click anything)
I have submitted numerous tickets to wix support. They suggest to check with my internet connection, hardware, browser,etc… I have Tried all!
Also, I have started to notice this weird thing; every time I run the editor, one or two elements have changed their size and position to a noticeable extent. This happens even when I correct these elements, save and reload the editor. I see this in all of my sites when I open the editor. I switch to multiple devices while working on a site.Like i close the editor on one device, open in another and continue my work. I do that a lot. Could this be the cause?