iPad Not Recognizing Touch

Has anyone noticed that the movement control is unreliable on the iPad? Very often, while I’m moving the direction control no longer recognizes my finger, meaning my tank stops.

I’ve adjusted the size of buttons but can’t seem to get it right. There are times I don’t even move my thumb. My tank is moving forward then the forward direction button will flicker as if it can’t tell if I’m pushing up or not.

I’m on an M4 iPad. I’ve been playing for 10 years, so definitely not new. But this is driving me nuts.