Hi
Iv seen this happen with a a couple iPod touches and all I had to do was clean the connectors with some 99% isopropyl and this issue went away
The isopropyl alcohol helps remove any dirt and debris that our eyes can’t see that could cause the screen not to work properly
If that doesn’t work I would contact iFixit customer support to see if they can do anything about the issue
Hopefully this helps
Any questions please asks
Thanks:-)