Hi @Helmut4Boskone,
Thanks for posting a question.
As I suspect this isn't something our other members have experienced, I thought it best to respond directly.
The only scenario in which I am aware of where this has occurred previously, is where there is a regional mismatch between the devices regional settings and that of what has been chosen in the Dyson App.
For example, if you have chosen your devices region to be ‘Singapore (GMT+8)’ and the Dyson App is set to ‘Beijing (GMT+8)’.
Could I request that you double check your devices and the Dyson App region and ensure that these match?
Hopefully this resolves the issue. Feel free to @Me in a reply if you need further help.
Thanks,
Stuart