Greetings,

I installed 3 Deco S4 units a couple of months ago to address some coverage issues in my home.  The system is running in AP mode with the main unit connected to an ethernet switch which is in turn connected to my router.  All 3 Deco units use ethernet to connect to each other. 

The system was performing flawlessly until I installed 3 new Amazon Fire Stick 4k units on the network as potential replacements for some DirecTV Stream boxes.  Two of the three Fire Sticks connect to the wireless network while the third is hardwired into the network.  Now, every time I run a speed test on any of the Fire Sticks my Deco network goes off-line (Red LEDs on all 3 units) until I power cycle the main Deco unit.   Also, some of the Fire Stick videos are pixelated (the reason I'm running the speed tests), while playing the same video through the DirecTV boxes results in no pixelation.

Has anyone else seen this behavior?  Is there some particular configuration item on the Deco I should be checking?