I have had the screen I bought from Pimoroni attached the the Rpi2 for a month working fine. Although the touch screen fails to respond to touch when the PI is not touched for an hour or longer the only way I have found to bring back the touch input is to restart.
When I do a sudo apt-get install update then upgrade after reboot screen flashes on and off every second or so then stops flashing with a white screen.
I can communicate via ssh and I am running jessie.
I tried many things, eventually I wiped the SD card and put on a working image.
A week later I thought I would try again to upgrade, just in case it was something random. Now the white screen is back.
Anyone else have this problem or know the cause, because I am a bit worried about doing this all over again.