I bought 2 official Raspberry Pi 7 inch Touchscreens and 2 Raspberry Pi +3B devices. I connected everything and the screens are working, most of the time: about 1 out of 10 clicks/touches on the screen is not registered by the screen/pi. The mouse-pointer does not move and nothing happened. This especially happens when touching/clicking at a faster (but reasonable) pace. This is very annoying.
Does anybody know a solution? The issue appears on both screens. Both Pi's are running Raspbian Stretch 9.
Any help or suggestions are very welcome!