Have you enabled Fast Roaming and / or AI Roaming on your controller? Do the devices you are trying to connect support roaming?

@Philou22_france Hey When you are running the router in managed mode via the controller, you don't need / cant set anything locally on the router. All configurations need done via the Controller,...

@kruuth The mounting ears on these are generally pretty standard, any one should suffice https://www.ebay.co.uk/itm/352001780553

@Aneek To be perfectly honest it wont matter which one you purchase, the bottleneck will be applied at the router (internet). In short both these switches are unmanaged and have a throughput of...

@Romren This may not be the Deco but rather your internet connection that is throwing the warning, what speed is your internet connection? 35 devices is not an insignificant amount, and I would...

@Plankton82 Hey No sadly not, the controller is required and needs to be online all the time for Mesh to work. Basically the controller will make the decision when and how to roam devices, along with...