iPhone 6 Plus touch screen issues - replaced screen as well

Hi,

I have an iPhone 6 plus i replaced the back on as it had bent a little.

The phone worked fine for a while and I had removed the screen multiple times to clean camera lens and replace it etc.

Then the touch screen cable wouldn't click down as well and I started getting a couple of lines on the same spot intermittently and the digitizer became erratic and wouldn't work where the 2 lines were.

I replaced the screen and am still having ghost touch issues. What gives?

I had sent off the screen to someone to replace the digitizer FPC connector and he said that there was continuity on all pins and it was all in perfect condition