@ukmartian 

Hi, have you checked via your smartphone to see the current signal strength of 2.4ghz of the place where Alexa is installed to confirm the current issue might be due to the weak signal? (You could test via WiFi Analyzer or Ubiquiti Wi-Fiman APPs)

Or you could also move the Alexa next to a Deco M4 unit to see whether the streaming service will be improved.

If the steaming performance got greatly improved after moving closer to the M4, 

• If the whole house is under the same electric meter or power grid, a pair of TL-WPA4220 KIT will be recommended to extend the signal.

How does Powerline Work?

(The network layout will be like:

Internet---ISP modem---main Deco M4)))((( satellite M4#1)))(((satellite Deco M4#2--TL-PA4010~~~~~TL-WPA4220)

• Or you could also consider adding one more Deco M4.

Thank you very much.

Best regards.