2.4GHz channel intermittent speed problems, hub 2

[NotaNovice]

My FTTP connection with Hub 2 has been installed about 3 weeks. In that time I've fought and fought to try and stabilise the speed on the 2.4GHz channel. My 500 Mbps connection can drop as low as 3 Mbps down and 6 Mbps up on the 2.4GHz channel. A hub reboot fixes the issue, sometimes for a day, other times for less than a few minutes. The speeds when good can achieve 500 Mbps through my phone in another room from the hub. I used to run DDWRT software using a separate router on my old Virgin Media connection, so I'm decent with networks. With the limited tools available in the hub 2, I can't stabilise the 2.4GHz channel. 5 GHz never skips a beat. I don't like that the SSID's are the same on both channels, but I can't do anything about that! Can anyone help, please? It's killing my CCTV etc!

[TimCurtis · Accepted solution]

@NotaNovice 

Is the 2.4 GHz band set for auto channel selection or have you set it?

Do you have Digital Voice as if not why not use your old router?

[countrypaul]

If you still have your old router you could turn off the 2.4GHz band on your SH2 and use your old router for the 2.4 band. You would need to disable DHCP on one router, make sure the routers are on different ip addresses in the same subnet and link them ethernet port to ethernet port. Otherwise as @TimCurtis suggests use the old router if it supports FTTP.  Another option is to use a separate Access Point (AP) for the 2.4 GHz, you could buy one that supports WiFi 6 or 7 if you wanted.

[NotaNovice]

Thanks for the help guys. I bought the TP LINK Archer AX72 and I'm using the hub2 as a pass though device. I've also separated the 5GHz & 2.4GHz channels because which ever bright spark decided that joining them together with the same SSID was a good idea was mistaken.