Roon not finding Sonos devices

Core Machine (Operating system/System info/Roon build number)

Roon Version 1.6 (build 416) stable (64bit0

Network Details (Including networking gear model/manufacturer and if on WiFi/Ethernet)
FortiGate60E Firewall, FortiSwitch 108D, FortiAPs 223E; several subnets, but routing is enabled. I can see the Roon Core from the Roon remote on my iPhone. Wireless is 192.168.2.x and LAN is 10.10.10.x
Roon Core is calbed [ DHCP]
Sonos is Wireless e.g.

Audio Devices (Specify what device you’re using and its connection type - USB/HDMI/etc.)
All wireless and all working well on Sonos.
2 x Sonos Connect [can’t see]
1 x Sonos G1 Play5 [can’t see]
Pair of Sonos G2 Play5, can see one of them

The issue is that the Roon Core can’t see all of the Sonos devices or play from any of them.

I re-built the Sonos network and brought them all into the 10.10.10.x network. They appeared nicely in the Roon Core list. I then had to re-boot the machine and they’ve all disappeared again…

OK, they’ve come back… I must just be impatient.

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