'

I should add that my HP2550 console receives sensor data without interruption.

You say you're not having problems with your HP2550.
Is the HP2550 in the same place as the GW1100A?
If not have you tried placing the GW100A next to the HP2550?

Assuming you don't have transmitters other than ISS and maybe a separate wind transmitter then see if you can still source a 6351 Vue console from somewhere and use that with pressure setting = Altimeter in place of the Envoy. (If the pressure error is important enough to you!)

By what means are you configuring the Envoy barometric pressure in relation to Station Elevation & Sea-Level reading?

.......
"when you say it disconnects from the sensors, does this mean mean that WS View Plus (WSV+) stops displaying the live data ? : no
(if no sensor data are transmitted, WSV+ disconnects respectively doesn't build up the connection to the gateway)
If so, does the WebUI (https://IP-address-of-your-GW1100) show the same behaviour ?" : yes

So - when you say here "no", that means that WSV+ still DOES display data => the GW1100 receives sensor data (otherwise WSV+ couldn't display them) - so it doesn't disconnect from the sensors.

Before I go to further conclusions, please confirm that WSV+ displays the live data (or you said "no" = doesn't stop, but meant "yes", it stopped = does no longer display data).

To make it simple: can you see live data of the GW1100 via WS Vew Plus ?

Waiting for your reply and will take it from there.

'm sorry I wasn't precise when describing the problems with my GW1100;

"when you say it disconnects from the sensors, does this mean mean that WS View Plus (WSV+) stops displaying the live data ? : no
(if no sensor data are transmitted, WSV+ disconnects respectively doesn't build up the connection to the gateway)
If so, does the WebUI (https://IP-address-of-your-GW1100) show the same behaviour ?" : yes

Reconnect within 5 seconds doesn't work technically - so what do you mean ? : no
- you restart WS View Plus after five seconds ? : no
- you make a reset (pressing the black button between the red and blue LEDs for > 5 seconds) ? : yes

I assume that your GW1100 is connected via WiFi/router/internet to ecowitt.net - so, do the one-minute updates also stop ? : yes
Are there gaps in the table view of your ecowitt.net dashboard ? (5-minute records). : yes

How do you know that the GW1100 disconnects from the sensors every two days ? :  disconnection dates :22/03/24, 25/03/24, 30/03/24, 02/04/24, 03/04/24,04/04/24, 09/04/24,12/04/24.
Are you permanently sitting in front of the WSV+ app ? : no
What indicates for you the 2-day disconnect ? : it's approximate
Does this disconnect always happen at the same time (clock) or after the same period of time (duration since last reset/restart) ? : no, without my intervention the gw1100 no longer receives sensor data.

I should add that my HP2550 console receives sensor data without interruption.

I hope I've described my problem accurately.
thank you for your patience

Good evening