New Router 2.4 v 5 GHZ v missing components

Sounds like your router is challenged. Can you add a proper router? If not, just disable 5GHz on the one you have and see if that improves things.

Usually you can put the ISP supplied router in Bridge Mode and connect a proper router, aside from getting your Sonos working a better router usually offers better services and options.

Thank you, I will try disabling 5ghz, but what do you both mean by ‘proper’ router? It’s direct from Vodafone, and supposedly their latest?

Another user recently reported the same issue with using the Vodaphone router.

Whilst the ISP’s router may be their latest, that doesn’t mean that it compares favourably to purchasing your own router, which allows full customisation of your network, which isn’t necessarily possible with an ISP router.

ISP routers are generally bare-bones with primitive or half-implemented features. They are cost-reduced to basically be a NAT gateway for web browsers and can be a challenging when actually used for more advanced features, in this case inter-device data transfer over the local network.

Thank you for the replies, I wasn’t aware of these problems as there’s not been any problems when I’ve switched over routers before. 
I’ve got home this evening to find that more of my speakers have disappeared including individual ones that are paired with another that working. 😡

So I’ve delved deeper into the router settings, I now have 3 nets, a 2.4, 5 and a third 2.4, 5 and 6 GHz combo. I plan to connect Sonos to the 2.4GHz one when I get some time. I’m assuming that I will have to reset every single speaker again and this will save me from having to hard wire my beam in? 
OR would it be better to hard wire one to the router and set up a completely different net? 🤷🏻

If you do attempt to change the Wi-Fi credentials, certain players without Bluetooth Low Energy (BLE) need to be reset in order to receive new network information. See Unsupported Products here https://support.sonos.com/en-us/article/connect-sonos-to-a-new-router-or-wi-fi-network

Connecting using wifi is the Sonos recommend, method for most users.

Using a wired connection, moves you to Sonosnet, that is older and no longer fully supported territory. I redid my setup to remove multiple Ethernet connections and use onls wifi and things are more stable,.

No longer fully supported in the sense newer devices and portables are not compatible with SonosNet, but a wired system is still fully supported from a support point of view.