I upgraded to the nest WI-FI last week with 2 points, works great apart from when I watch tv, my speed drops from 250mbps down to 25mbps,i have traced this to my wireless surround sound system (Samsung q90r), the speed maintains when I have it unplugged, I have tried moving it further away and it only drops to 90mbps,any advice on a way around this would be greatly appreciated as i was completely unaware of this when i bought the system.
One option would be to use ethernet cable to that device instead.
Another option would be to get mest points with ethernet ports, so Google Wifi or Nest Wifi router, not Nest Wifi add-on point. Then place one of them close to the device in question, and connect the mesh puck to the device with ethernet cable.
A lot of wireless surround systems use a frequency range that overlaps with the spectrum Google/Nest WiFi use for their mesh interconnect and 5GHz WiFi client traffic. If you need to keep that surround sound system as-is, then you'll want to make sure you aren't trying to use WiFi for anything nearby. As @olavrb mentioned, Ethernet is a good option for getting the TV off of WiFi. But, if you do that, and can only connect to a nearby mesh access point (like another Nest WiFi Router unit or a Google WiFi unit), you'll also need to make sure those mesh access points are also well separated from your surround sound system themselves. 15 to 20 feet might be enough.
Thanks for the help everyone,I cannot ethernet my surround sound system,after leaving it switched off for a few days my speed still drops dramatically from 5pm-10pm,my internet doesn't drop out no matter how many users but the speed drops to 10gbps between these times then back up to 250mgps after 10,I plugged the surround sound back in the speed tests always come out the same,I never had these issues before nest,now I'm left wondering how accurate the home speed test actually is?