Hello

I have a set of 3 pcs X20 Decos in my house. 
All working with Fiber 250 MBits - using WPA3 and Dual band. 
For ~50 IoT devices I am using the special IoT network with WPA2 and 2.4Ghz. 
Around 100 devices in sum. Not all are online at the same time - around 45-60 devices are online at the same time.

Only some devices in my cellar have only 1 bar of WiFi signal. They work - but I thought a 4th Mesh could be optimal for better coverage. 

So I bought one. 
 

As soon as I add the 4th Mesh and reboot the whole network goes bonkers: 2-3 Meshes are always shown offline, most of my IoT devices get no connection, sometimes when connecting to the IoT network by phone it shows "no internet connection". 
 

As soon as I delete the 4th Mesh and reboot everything's fine again. 

Also using the 4th Mesh as a standalone network seems to work. Normal WiFi as well as the IoT one. 

Update: Deleting an existing Mesh of the 3 devices and replacing it with the new one also works. So it seems the X20-limit seems to be a maximum of 3.
 

Are the X20 limited to a maximum of 3 Meshes?!

Kind regards

StA