We use hosted ACS2 to monitor clients' Draytek routers. One of these (a Vigor 2860ac) repeatedly sends DeviceLossConnection alarms at varying intervals of around 20 minutes +/- 5 minutes.

However, when I log on to the router the System Uptime and WAN1 Up Time show as having been on for hours.

In the Command Line Interface (CLI) when I type in the sys ver dbg command it shows 'Exception debug info is empty'.

I have compared the TR-069 Settings page against another similar router which we monitor and there is no difference.

The router in question has a BT VDSL connection and has the latest firmware (3.8.9.5_BT).

Why are we seeing these DeviceLossConnection alarms when there is no apparent loss of connection?

We are also seeing the exact same issue with a Vigor 2952. We get an email saying Device Loss Connection approximately every 15 to 20 minutes