Wireless Wi-Fi / Internet Connection Problem

Hi all, I have a Linksys AE1000 wireless-N USB adapter. I've had it for about 4 years now and it's never given me any trouble. Where I stay, I have access to the internet only via wireless Wi-Fi. I'm renting a room and the wireless router is in the landlords room. During the last two weeks I've noticed that my connection, computer, or some other problem has come into play that does not...