llamee1 I have the same problem as you and I have 3 eero routers.  I took off one router (the middle one) and it boosted the eero router that is the farthest from the base, but I still get only about the third of the speed I should be getting  considering the normal reduction of speed.  If I use only the base router connected to the modem for the whole house, it just doesn’t cut it.  Although my eero system is an old one, I’m truly disappointed of it’s performances and I am still looking to find a powerful router system that can give me at least two thirds of the speed I’m pretty paying for on all the house equipments.  In the beginning the system was fine but as the upgrades came, my network got slower, it’s fine if you’re connected to the base, but pitiful for the rest… eero model number # J010001

Steve Beaudin So I was using the Netgear extender to create a different Wifi network with a different SSID. After reading how people could have double the eero's in houses the same size or smaller with no issues, I decided to try another Beacon placed further away from the Pro 6. Everything was fine for about a week and then the slow downs came back. I finally called support and they had me do a hard reset on both units using the actual buttons. I'm only a few days in, but so far, things have been fine. I thought deleting the network and deleting the units was the same as doing a reset. The tech told me they were two different things. So maybe try doing hard resets on all the units (holding the reset button down until the light flashes red) and setting everything back up from scratch. Once you go back into the app, they will show offline. Then you can delete the network from the app and start the setup process. Hopefully it fixes it.

Steve Beaudin No sooner did I post that and the slow downs have returned. I would recommend calling in and starting a trouble ticket. I'm sure they'll say do a hard reset and try it, but I can confirm it doesn't fix it. I called in this afternoon and I'm now working with level 2 support. The rep on the phone said this was unusual behavior. I said there are plenty of people complaining about this behavior online. Maybe the more calls/info they get, the sooner they can fix it. 

  txgunlover  thanks for the tip but they are not extenders, 2  eero routers.  I would not do that anyway and would probably change the whole thing if it gets worse.