Google Home says it opening my shades but it's not

After a period of time, maybe a few days, of successfully asking my Google home to open my shades, eventually the assistant says that it is opening my shades but nothing happens.

I can successfully open them with my phone using the Bond app. I have tried rebooting my GH mini speakers with no change. I have also tried resyncing devices in GH and that did not help. The only thing that has worked is restarting the bond bridge, i.e. unplugging it and plugging it back in.

Is there anything else I can do to keep this working consistently?

Also, related question… Is there a recommended way to restart the bridge apart from cutting the power?

Thanks,
Simon