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My kid for weeks now has been having issues with the WiFi but I’ve been chucking it up to plaster and lathe house and distance from router. I just tried to print something from my phone while on the 2.4Ghz WiFi which worked in the past but was having issues. This lead to me removing the Ethernet cord from my computer and trying to connect my computer to WiFi.

Upon running a speed test on speedtest.net, I was getting 5Mbps, if I’m lucky, while the 5GHz gives 300+ Mbps and Ethernet 500+ Mbps. I saw similar posts talking about changing the channel so I tried that and the best outcome was 30Mbps. Is my Surfboard SBG7400AC2’s 2.4GHz WiFi components shot? Did I hit the side of it or something to cause damage internally? Why is it so much slower? I get WiFi is supposed to be slower than wired but not to this extent. What can I do? Does Arris have an address to diagnose your router or something?

Let us help you with the difference between 2.4 and 5G network. The 2.4 GHz band provides longer-range coverage but transmits data at slower speeds. The 5 GHz band offers less coverage but transmits at faster speeds than the 2.4 GHz band. So to test the case further we can check for the modem signal level. please follow the steps mentioned on the below article to check for the modem downstream and upstream values.

http://arris.force.com/consumers/articles/General_FAQs/SBG7400AC2-Cable-Signal-Levels

Let us help you with the difference between 2.4 and 5G network. The 2.4 GHz band provides longer-range coverage but transmits data at slower speeds. The 5 GHz band offers less coverage but transmits at faster speeds than the 2.4 GHz band. So to test the case further we can check for the modem signal level. please follow the steps mentioned on the below article to check for the modem downstream and upstream values.

http://arris.force.com/consumers/articles/General_FAQs/SBG7400AC2-Cable-Signal-Levels

All value according to your link are within their appropriate range.
 

Since all the signals are in range, I would suggest changing the Wi-Fi channels and monitoring it for 24 hours.

http://arris.force.com/consumers/articles/General_FAQs/SBG7400AC2-Changing-the-Wi-Fi-Channel

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