Sonos Products playing up after working fine previously

Sonos One set up in “Bedroom” with a Sonos One SL stereo pair

With built in Alexa and Sonos voice assistants:

When I say Alexa play BBC Radio 2 , she says “playing BBC Radio 2”, and then…silence.

When I ask Hey Sonos play BBC Radio 2, it says “Okay, playing BBC Radio 2..  then silence.

It does the same with any radio, the BBC App, Rayo, Tunein etc.

I tried resetting my Sonos One to factory settings, re-added it, and still exactly the same thing happens. 

I connected it with ethernet cable. Same thing.

Sonos Arc set up in “Living Room” with Sonos Sub and two rear Sonos SL’s. The Arc is ethernet wired and connected to TV with HDMI.

With Alexa:

Will start playing a radio station when asked, but when you ask it to stop, it ignores you.

If I ask Alexa to play Radio on Bedroom on the Alexa phone app, it works ok. 

This has all started happening in the last two weeks. 

I have rebooted everything, removed and re-added Alexa, Factory reset the Sonos One 3 times. I don’t know what else to do.