I found a possible correlation between the phone's temperature and whether the touchscreen works or not, as it has sat in sleep mode for a few days now and the touchscreen seems to be working every time I grab it. Phone has consistently been at room temperature every time I've tried. But when I plug the phone in and charge it, after a minute or two it warms up a bit to the touch...and the screen won't receive any touch input. It's wacky.
A loose cable does seem possible, especially on the motherboard side. I'm still waiting on that replacement screen.
I searched "QX1050" an