Alan98 wrote It is really important to be able to turn off the Wi-Fi when not in use. I take this feature for granted in these systems. @Alan98 I have completely opposite experience. Whatever WiFi...

@JoeBlow You need to establish decisively if your X20 unit does or does not broadcast on 5GHz. This is how you can do that. Install WiFi analyzer on s21, I recommend this one from google app store:...

@smigs Another two possibilities are: 1. Satellite Deco M5 negotiated 100Mbps to the switch, instead of gigabit. This can be tested by wiring laptop to second port of Satellite M5 and running speed...

@aggivatedMAN You can only manage Deco mesh with Deco app installed on smartphone. If someone else configured Deco mesh for you, you'll need to ask them give you access to Deco app. See this TP-Link...

@JoeBlow This is obviously hardware failure. There are no hidden configuration settings to enable/disable 5GHz per Deco unit. TP-Link Support checks this forum during business days in Asia-Pacific...

@NeedHelp0192 If your auntie's mobile device can connect to 5GHz, it should be able to connect to 2.4Ghz. Make that device forget Deco Main Network, connect it to Guest Network and see if lagging...