On: How does Windows decide whether your computer has full Internet access?

[bombcar]

It's probably because of the hotspot with the same SSID.

You should be able to set wifi network priority so "home network" is first but if not available it automatically goes to "phone network".

[muppetman → bombcar]

The way I've fixed it is to reset the Network Settings on the iPad. Brutal, but it works. I hate that this stuff is hidden with no way to change it.