Really weird keyboard issue

Hi everyone,
I have been experienced issues wih my dell inspiron 5620 keyboard for some time now event after replacing the keyboard it has come back to affect the same set of keys. 

Whenever I go to use my T, Y, Backspace, Left Shift, Caps Lock, F4 & F7 they sometimes won't work, when one of those keys is down all of them are. A temporary but decreasingly effective fix is to tap a set of those keys repeatedly until they start working again. Yes I have tried external keyboards, they work but I need the laptop keyboard for daily use.

Fix Attempts:

Replaced keyboard and it came back after ~a month
Tried reseating the keyboard cable
Tried restarting computer