Touch Screen Won't Work On I Pad Pro Part Way Through Workout.

On a few occasions my I Pad Pro touch screen will not respond part way through a Zwift workout. Generally it clears up in 5-10 minutes.  Overall, the I Pad works extremely well.  Just a little annoying but not a huge deal.  Sometimes the “hand wave” function takes three or four taps to work too.  But the other icons work well. Note my I Pad has never froze up with general use.