I think I've finally pinned down at least one cause of tabs losing sync between SW and Chrome - at least it seems reproducible for me now.
Simply open a new tab, then do a google search directly in the omnibar - make sure it's a true search and doesn't autocomplete a URL. When the search page results are displayed, the SW tab shows 'XYZ - Google Search'. Then click on the top link - for me at least the SW tab stays as 'XYZ - Google Search' and from now on, the link is lost - no amount of refreshing will bring it back. On restarting SW via the extensions tab, I see the 'XYZ - Google Search' as a hibernated tab, and the live page as a new tab, fully functioning again.
Hope you're able to reproduce it :)
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