@Gotstafish,

Sorry to hear that such a small change broke your network setup like this. If I recall correctly, the Decos will optimize their connections to each other automatically every day, however, you can 'encourage' this process by finding the "optimize now" button in the Deco App. If I may ask, what did customer support say is the answer to your problem? A Network switch for wired backhaul?

The number one setting that causes issues for our users would be the QoS setting in the Deco app; you can try to disable this function to see if your Deco Nodes are given their full potential speed. The second feature that causes issues with some of our user's devices, that results in poor connection quality is the "fast roaming" option, as some devices, like iPhones, have difficulty switching bands when this newer feature is used.

Let me know if neither of these things fix your issue and if you have any suspicions for why this speed decrease would occur.

  @Gotstafish 

Hello, yes this was a scam for sure.  TP-Link does not charge for our support and we would certainly not tell you your network was creating too many IP addresses.  Your IP address is only limited by two things.  Your subnet and the DHCP pool settings of your router.  If you can please provide more information such as the phone number you called or the website you went to.  

Additionally, we recommend all customers review this FAQ

To speak about why all units are connecting directly to the Main unit.  This is because when the Deco is first powered up it will do a scan for the best connection and will establish that as its point of transmission.  This can be Redone by power cycling.  The network optimization currently only optimizes client connections.  We are working on future enhancements and show have those out soon, what those enhancements will do we can't say yet.  Currently we recommend with the units in their current locations power cycle each Deco.  Plugging in the furthest Deco last.