Doorbird, Unifi and Sonos.

There is a probably a broadcast storm issue, crippling your network, since Sonos, incredibly, still uses a very old / non-standard implementation of STP that is causing the issues. The fix for this is relatively simple. You must, for all your switches, use STP instead of RSTP. This may interact with the DoorBird devices, as the use of RTSP or disabling is recommended here. Here I would recommend disabling STP on the individual ports where DoorBird devices are connected. To do this, proceed according to the Unifi homepage as follows:

How to Disable/Enable Spanning Tree Protocol Per Switch Port

1. In the UniFi Network application, go to the UniFi Devices section and click on the switch that you wish to disable/enable STP on an individual switch port, opening the Switch Properties Panel.

2. Navigate to Ports in the Properties Panel. Select the switch port, and click Edit Selected, or hover over the switch port and click Edit.

3. Click Profile Overrides, and toggle Enable Spanning Tree.

Please note that the configuration changes are without any guarantee.