Did you configure wireless part on web interface of your IP camera? It should match settings on your router and repeater. Bypassing the repeater, can you make it work wirelessly?

After about 2-3 hours of use, the middle light on the adapters will start flashing green and I lose connection. How about status of local area connection at that time? Connected but no IP address? Or...

All light went off or just powerline light? Is it still under warranty?

It is out of warranty, right? If so, you have to buy a new one. WPA281 can work with new models. No worries.

:cool: Cool~

How about status of powerline light on each adapters? If it is on but cannot obtain IP address, you may try static IP on wireless clients. By the way, wired connection to WPA4220 works or not at that...