Matter/Thread x UniFi AC's: internetconnection unstable

We have a good and stable connection, until last weekend. We have to unplug the modem several times a day to get a connection again. The Wi-Fi connection via UniFi remains active.

Now I started thinking back to what was added to the smart home in the house last week and the only thing I can think of is Eve Aqua with Thread protocol. That is connected via the Tado X and that again to Apple TV.

The modem is quite close to the outside tap at the front of the house.

At the back we also placed an Eve Aqua, which is directly connected to Apple TV.

Is there a chance that these things are blocking the signal in some way? I have not had any problems with the Tado X since it was installed in October, it is also connected to Apple TV via Thread, but not so close to the meter cupboard.

I have now removed the Eve Aquas (completely offline) to see if the loss still occurs and that has not been the case for the last two days. I find it quite strange. :) Could it be interfering with UniFi mesh?