Unable to connect

My Netgear extender says unable to connect when I start my computer. My router is downstairs with my main computer and I have an office computer upstairs. I have an extender to give a good signal upstairs and that connects easily to the router. However, the upstairs computer won't connect easily to the extender. It says 'unable to connect' after the upstairs computer has been asleep or shutdown. If I restart the extender it will connect then and generally stay connected while the computer is working, but that's a pain to do every time. I've tried a factory reset and I've set up a static IP address. Is there anything else I should try.