If your iPad screen is freezing, there are some possible issues related to this. 

1There might be software conflicts 


2. Memory corruption that puts your iPad on a loop.


    The number one solution to this is to turn the iPad off and then on again. 

    You can do so by pressing and holding the power button. Swipe the slide to power off.

Does it keep persisting? Force restart the iPad.

Press the volume up button once, press and release the volume down button and, soon afterward, press and hold the Power Button until the device restarts.

If the problem is still not resolved, please submit a ticket here.