Why are portions of my digitizer periodically unresponsive?

I replaced the digitizer today. After charging the iPad (it had previously been dead) I wanted to see if I had installed it properly. When I attempted to unlock the iPad I noticed that only one or two numbers actually pressed when I tapped them. At first I thought I did something wrong but after turning off the unit and turning it back on everything was working fine, there were no noticeable dead spots and I could easily log in and use the iPad.

After leaving the unit plugged in to charge more I grabbed it to test it again and noticed the exact same issue. The digitizer was unresponsive in most parts and I could not unlock the iPad so I turned off the unit and then turned it back on and then yet again everything seemed to be working. Does anyone know the issue here?