Did you try setting yours up for 4K all the time? What's funny is that I have the touch screen problem too but I switched it to 4K and it went awayHopefully this fixes some of the bugs like the touch screen issue..
Downloading mine (Customised AU) now.
291Mb update too
which country and operatorCouldn't find any update log anywhere. Instead, all I could find are posts complaining that Sony never releases "Update Logs"...
That's Sony for you!
xD