Have a look at the manual on your phone app. There are a lot of reasons why the start/stop function won't function as you expect, including outside temperature, heated windscreen being on, passenger compartment temperature, engine temperature.....the list goes on.
If you do a lot of short journeys, the battery may be slightly discharged (another reason why the start/stop deactivates), but it's probably one of the other reasons. I'd put money on it working again once all of the conditions are right.
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