Replaced digitizer/screen assembly, screen still erratic

I have a Samsung Galaxy S6. I purchased a full refurbished screen and digitizer assembly from ifixit.com. My original screen has been erratic for months. It doesn’t open the screen for apps, repeat displays time and date, and other randomness. I have to use the power button to reset screen over and over again to get anything done. It’s maddening.

I had someone look at it and he said the digitizer was bad. Thus, my purchase of a refurbished (“A”) screen and digitizer assembly. I just replaced it all - even those dang tiny antennas, got it all put back together, turned it on…and it’s doing the same dang thing.

Am I going to have to replace the phone altogether??? This is a refurb model sent to me after a SECOND insurance claim (first because my phone wasn’t charging, second because my phone was stolen). This is my THIRD item of this model. I don’t have replacement available through my carrier. So, it would be really great if I could get some help fixing it.

Thx.