Just opened my wife's 6S. Restored the OS just to ensure nice clean copy. Set up iPhone as new (did NOT restore from backup). Added music, TV shows, photos, apps that totaled 80GB. Sync'd 6S. Now telling me it has 50GB of "other" and cannot sync the phone because it's over storage space. What??? Literally never used. No web browsing, no texting, no nothing. WTH??? When I unplug and plug back in the phone with a USB cable, at first the summary bar in iTunes shows the CORRECT amount of storage for all items (i.e.; shows the same info I see in Settings>General>Usage) for the big storage apps (photos, videos, music), then the "other" bar swells to a massive 50GB and no syncing anymore. This cannot be the result of files that have grown over time and this is an immense amount of "other" space. Every solution I've read refers to restoring the phone as new. But, that's what I just did and the problem started from the beginning. Makes me think there is a problem with an iTunes file, but I don't know which one. Any suggestions???