I am seeing this same issue (new unit purchased this year). Will randomly lose connectivity for ~2-25 minutes then come back. I have a device that checks “heartbeat” of all devices like the user above.
When it is offline i have checked the device – the display is powered on as normal and the Ethernet jack shows solid connection (green) and activity. But not able to connect by http.
Has there been a cause found / fix found for this? I can post logs from my network uptime device if helpful.