All of my official v3 ST motion sensors not working this morning (UK, 26 Dec 2019)

Has anyone else experienced this today. UK.
Has been working brilliantly but all of a sudden, they have all decided to stop working.

How are they not working?

Not reporting?

Reporting but not triggering automations?

Reporting unreliable?

Not visible in the app?

Sorry, should have elaborated more.
Showing up as unavailable. Some of them have been doing that for a while but they generally did still work.

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