Hello everyone,

Four weeks ago i bough myself the TP-Link Deco P7 mesh network setup.

2 sets of 3, so six deco's in total.

Very easy to set up. Full wifi throughout the entire house, perfect.

Week later, I began wiring the deco's. Bought a TP-Link switch, set it up, rebooted the whole show and voila: full wifi & full speeds!
The only reason wiring the setup is for better internet speed. 
 

But I won't be here if it wasn't for some troubles lately. Started last weekend.
Deco's dropping out of network, unreachable with the app.
Restarting won't help. Reset to factory / wifi works perfectly. As soon as I use ethernet, they flip.

Been going back and forth like this. Sometimes I got all of them to work. But within ten minutes the first deco's start to go offline. Sometimes they come back up online by themself, but more frequent they don't come back at all. 

Yesterdag evening I took all deco's in one room. Reset the entire network. Started from scratch.
No problem. Got them all working via Ethernet. Functioned perfect the entire night.
Started moving the deco's in there permanent location and halfway in and the first deco already went offline.
Decided to start over, like last night. Reset the entire setup. Could not get past 2 deco's to connect via ethernet. Took me almost an hour to get the 2 deco's working via ethernet.
Started adding more deco's via wifi. No problem. But as soon as I wire more deco's via ethernet, the enitre network just freaks. New deco's won't connect, deco's already added to the network will fail. 

Can't help but thinking; this used to work perfectly almost 3 weeks in a row!
As far as I can tell, nothing in or around my house has changed.

If I remove the ethernet - I can get the whole show up and running within ten minutes. I think there is nothing wrong with the deco's itself.
Can't trace back the troubles to one single device, they all freak out in random order.

Switch and deco's have the latest software update. Been very happy with the way things worked up until last weekend.
 

So please, shoot! I don't have any clue how to get this funtioning properly.
 

Thanks in advance.