So Ive been plagued by that Switch To - Retry window for years and now I know whats causing it.....Its when Carbonite is scanning the PS files and updating my cloud backup.  Each time it happens, I check the Carbonite icon in the systray and sure enough, its either Updating files or has just finished updating within the last 90 seconds.

Im going to add some more RAM to my system this year and see if that helps at all, but for anyone else that keeps seeing this stupid window popup, if youve got an anti virus or cloud backup running in the background that scans your PS files, this might very well be the culprit.