Hi Yannick,
this problem has been confirmed here
and today here.
Is there anything we can do to support you finding the problem?
I also noticed, when the display stays connected for about three days (during that time it works perfectly without disconnects) then all widgets disappear which are visible on the screen. However, if you scroll down, all other widgets are there. It is just that those widgets dissappear which are initially visible at the top .