I have put a second Asus router between the Huawei router of the ISP and my network. The Asus router is set up with a static WAN IP address and connects to the LAN port of the Huawei router. The Asus WAN IP address is set up in the Huawei DMZ to avoid double NATing.
Since then my Ring alarm is reporting going offline and coming online again.
Any suggestions on how to debug this?