Since the update to firmware 1.5.2, I began encountering a lot of slowdowns and the Deco app would detect a lot of network congestion. I was running the Network Optimization through the app every two to five days. But at least it fixed things.

Now since updating to 1.5.3, the network has bogged down, but running the Network Optimization gets a network status of "Perfect." It is clearly not perfect, everything is clearly very screwed, and so far the only option that has worked as been rebuilding the entire network by restore. That's time consuming, and annoying, especially when you have smart devices that need to be re-added. I've since turned an old Mac mini into a wireless router using internet sharing, because, and this is true, I'm getting reasonable network speeds that my three Deco setup can't maintain. 

Anyone have a copy of firmware 1.5.3 I can downgrade to, or as had a similar problem but managed to solve it?