My son has a zflip3 5g, just recently has been having issues, it seems to heat up quite quickly even when not in use. Also display issues have arisen. When opening the phone the display doesn't always come on, and quite often when it does, it's just a scramble of colours (as can be seen in the image) but eventually I can make it usable after a bit of effort. I'm thinking could this be the heat? Or maybe a ribbon cable inside?