Last night it was again offline

What model is it?
How long have you had this station?
Have you replaced batteries?
I checked those stations this morning at 09:00 => all off-line for WU. The OP station was Ok at weatherCloud.
All 5 stations in the same area rermained offline from WU from 01:00 CET to 11:00 CET
But were still continuously uploading to other websites such as WeatherCloud.
Which kind of battery problem would occur at all 5 stations at exactly the same time-frame ?
And at the same time the failing batteries should not affect the upload of weather-values to WeatherCloud?
There were also no "flat-lines" in the graphs at WeatherCloud.
It could be that WU is testing their upload-servers in that period. There are enough topics about that.
As WU is moving back to their old upload-server it is important to check tomorrow morning if they are again off-line.
If so, someone with good English should post a question on the FaceBook discussion how this can happen.
Again my questions to @TOMeteo :
Maybe you 5 stations used the same shop to buy these devices ?
or you used the same person to setup those weather-stations ?
You all use EasyWeatherV1.4.n, maybe try to upgrade to latest version or to EasyWeatherV1.3.n ?
IN HET NEDERLANDS (IN DUTCH)
Nogmaals mijn vragen aan @TOMeteo:Misschien hebben deze 5 stations dezelfde winkel gebruikt om de apparaten te kopen?
of hebben jullie dezelfde persoon gebruikt om die weerstations in te stellen?
Jullie gebruiken allemaal EasyWeatherV1.4.n,
misschien kunt u proberen te upgraden naar de nieuwste versie of naar EasyWeatherV1.3.n?
Wim