yes there would be clients connected, the SSID is no longer available, so the clients have gone.
It may be worth a note that this issue has been going on for some time now, on 3 different devices in 3 different locations with 3 different configurations.
In my case there is nothing special in the config used, one SIM, one SSID, very standard.
I will pay attention next time it happens, collect the log file before and after, hope this will help.
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