The device has an energy-saving mode, which can also be recognised on the device itself, as the indicator light no longer lights up. If you briefly move the power switch upwards, the device wakes up again and reconnects immediately.
I don't think this behaviour is specifically described in the operating instructions. I think it only describes that the wear detection would trigger this behaviour, but not a missing signal. So I can actually only confirm that my device behaves in exactly the same way. What I haven't tried is that you can probably set the time until it triggers in the app.