All Smartthings motion sensors showing as offline

All 6 of my Smartthings branded motion sensors are appearing as “offline” and all my lighting automations have stopped. I thought it was one sensor and changed battery etc but now realise its all of my Smartthings branded motion sensors, of at least two different model types. The lights and relays and everything else is fine, it just the motion sensors, all of them. Rebooting hub didn’t help.

Most odd and I can’t figure it out. I’d suspect the device handler but it’s just the out of the box default setup and no-one else here is reporting issues that I can see.

Any ideas anyone?

Update: they are now all online and working