In your case it is 'Auto', but not 'Always on' and probably these disconnections are caused by something else. Try to browse through the device logs and see if something abnormal there. During a drop...

You wrote that you were able to see the 2.4 GHz band SSID briefly after turning on the router initially. After everything you've done so far and still can't see the 2.4 GHz SSID I would suggest that...

@Matthew1 If you used to connect to the grey port it's RJ11 cable (phone line cable) If you used to connect to the yellow one it's RJ45 cable (Ethernet cable) It depends on the service provider. If...

@Boyce Try these wi-fi settings: If you still can't see the 2.4 GHz band, try setting Wireless Mode as follows: If you can see the 2.4GHz band after this change that means you have to update you...

Very well. Keep observing till you're sure that it resolves the issue.

I believe it's better to use 'always on' like you were intended to.