iPhone asks 'Trust This Computer' again
Personal Hotspot being &quot;on&quot; while connecting the USB (tethering) seems to be the issue. Turn it off, connect the cable and turn it back on if required.
If you just need to use the hotspot and not bother about syncing iPhone using iTunes/Finder, then enter passcode once, &amp; tap &quot;cancel&quot; or &quot;Don't Trust&quot; second time onwards and you will not face any problems.