Sonoff zigbee bridge pro - all devices offline or not communicating

I replaced my Sonoff Zigbee Bridge with a Pro model in december 2022 and had some issues.

One time all connected devices were shown as offline and i had to reset the bridge and manually reset a devices, so i could add them back (i have 34 switches, motion sensors, door sensors, temp sensors and wireless switches)

After update 1.4.0, performance seemed to get worse. A couple of devices per day would show as offline, then come back.

Yesterday, all devices connected to mains power were offline (24) and all battery powered devices (10) showed as online but did not work.

After reset, i added all devices down stairs, the after i cut power to the bridge and connected again, nothing worked.
Reset again and nothing worked even from scratch.

I’m shipping it for warranty and have gone back to regular bridge, which seems much faster to connect.
Anyone experience something like this? Did i have a defective unit?

2 level house, reinforced concrete floor, 2.4 and 5ghz wifi powered by ubiquiti APs

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I’m the last month all of my ZigBee devices went offline or completely disconnected from the bridge pro

What is the distance between the devices and the bridge?

In my house, the limit is 5 meters with a wall between them.
More than this, I have connection issues.

I am using the Zigbee bridge only for temperature&humidity sensors (7 pices), but some of them are allways off-line, never come back by itself, only if I reconnect again them.

I have similar issues. Sometimes none of the devices linked to the bridge appear online… sometimes its just a few that drop off randomly… sometimes they come back on their own - sometimes I need to reboot the bridge to get them to show online again.

I had to switch off the 5 GHz WiFi frequency in order to get my Zigbee Bridge online again.
After the connection was established, the 5 GHz was switched on again and I never had any problems.

Similar issues too, when it offline never back to connected, must be do it again reconnect