Cannot back up: The iPhone disconnected

[PNutts]

Anyone else have this problem start after 10.3.2 / iTunes 12.6.1.25 (Windows 10)? Both my iPhone 7 Plus and 6S Plus started this nonsense after those upgrades. I tried the usual quick solutions: restart phone / restart PC / different cable / airplane mode & low power mode & background app refresh off. I'm willing to delete the current backup but not willing to Restore as New.
TIA

 

[Kantry123]

Anyone else have this problem start after 10.3.2 / iTunes 12.6.1.25 (Windows 10)? Both my iPhone 7 Plus and 6S Plus started this nonsense after those upgrades. I tried the usual quick solutions: restart phone / restart PC / different cable / airplane mode & low power mode & background app refresh off. I'm willing to delete the current backup but not willing to Restore as New.
TIA

Try backing up using iCloud and then restore ur phone as new and restore iCloud backup...that should fix ur issue

 

[BobCowe]

I was also suffering from this problem on m,y iPad Pro. Backup failed as iPad disconnected...
After having tried all the suggestions, I stumbled on this post https://discussions.apple.com/thread/8020128
which suggests deleting any apps taking up more than 3Gb.
For some reason I had Minecraft installed with 4.15Gb. Deleted it, and the problem was fixed immediately.