Wall Mount device regular shows "unable to connect to Home Assistant"

since a few weeks my wall mount Nexus 9 shoiws me the error “unable to connect to Home Assistant” (see similar picture below). It was running without porblems for a few months before. Does anyone have an idea how to solve the issue?

I’,m running HASS.IO with Operating System 3.10 and Home Assistant Core 0.105.2


Did you try the latest version 1.7.1?

I’m embarrassed but I think I solved the issue last evening with deactivation of W-LAN ECO-Mode. It seems to me that the internet connection was just shut of in the middle of the night :crazy_face: