@MA63 

Hi, Thanks for the feedback.

Please help me run the following test:

1. Turn off 2.4ghz on the main network.

2. Enable guest network for 2.4ghz only with a different SSID and test whether there would be any difference about the signal strength and coverage.

 And would there be any Bluetooth speakers, HDMI converter and microwave oven that work on the same wireless frequency nearby?

And may I know who is your internet service provider?

If the Deco kept switching from green to red, the internet connection would be very unstable and Does it still happen very frequently recently?

Wait for your reply.

Thank you very much.