Do you mean you need sign in to the management page every 5 minutes? it seems that there is no option on the router itself to extend it. While, as a workaround, you can use Tether app to manage it....

Hi, based on your request, a normal wifi router plus an extender may satisfy your needs. For example, Archer C7 + RE200; with Archer C7 connected to the port 2.

Hi, do you have the same issue with your device connected to the C7 by wired cable? If all the online games cannot be accessed? If possible, please list some examples. Meanwhile, is there any error...

The Deco does not support roll back the firmware, you can try to turn off these special settings on the Deco, it may help. fast roaming, device priority, the home care funtion parental control

The way to reset them is press the pair button for 15 seconds, then press the pair button on them for 1-2 seconds to pair.

Oh, then your firmware is the latest, have you tried to factory reset this router and reinstall it? If it still the same, it is better to contact TP-link technical support..