ipad mini 4 iOS 15 upgrade. Internet inoperably slow
I recently upgraded my ipad mini 4 to iOS 15 and now it is unusable as the internet speed is slow to the point of going backwards. It is not the internet connection that is the issue - it connects fine and the connection works fine on other devices. I have read that it may be VPN that is the issue, but when I go to settings to turn off the VPN the switch just automatically turns itself back on again. What can I do? Having upgraded to iOS 15 I now cannot use my ipad at all in any useful way.
iPad mini 4 Wi-Fi