"I'm sorry, there was an error and I'm unable to control your smart home device"

This is the reply I get now when I tell my google assistant to turn on/off any of my devices. This started happening just after Google Home had an update completely changing the layout.
First I re-linked my Vera Concierge account and it worked again for a couple of days but then it stopped working again and now re-linking doesn’t help.
If I select one of my devices in the Home app it says it’s not responding. Both the Vera Concierge connectivity tests work and the response from the assistant isn’t that it can’t connect to Vera Concierge but the actual devices.

Anyone else seen this or have any tips as to what I could try?

Just in case anyone else has this issue, I solved it by restarting the machine running the local Vera Concierge server software.