Sorry I do not know your house plan and your camera's position. Of course cable is more stable connection than radio. I give you advice's just from my experience with IP cameras and my troubleshoots...

Have you checked different SSID on the repeater? Then your computer have asked about password?

Do you have latest firmware on the router?

Do you have access to router configuration? If so then please check the firmware version and will update it.

What do you mean you said "requested features"?

Can you choose country in Wireless Settings or not? Sorry I haven't had this router in front of eyes. Are you from Italy?