If your iPad is frozen to the point that you can't reboot it the normal way, perform a forced restart. Charge the battery.
If your iPhone's touchscreen is not working, try to force-restart the phone. After rebooting it, the screen is likely to work ...
One of the main complaints about the prior-generation iPad mini 6 was "jelly scrolling" or screen tearing, and it sounds like it's a problem that Apple may have addressed with hardware updates to the ...