As far as changes to a newly launched page are concerned, I have 2 sites which have related stories' links updated on almost every page of the site - new and old - everyday. Constant changing. Sometimes twice or thrice a day too. The pages are guaranteed to be different the next time Gbot visits. Titles and h1 or h2 are updated as and when editorial needs arise - not concerned about gbot there at all. Have never faced anything I can put down to changes to pages. Whenever I have made changes on these sites or other sites I manage, constant changes seem to invite gbot more instead.