I have an 2010 iMac 21.5 inch. I have been having a problem where, I have my wireless network that I always work on, and then I get a few other networks that belong to my neighbors. I have noticed that in the morning when it automatically boots up for me, then it will either not connect to a network, or it will connect to one of my neighbors networks, and only sometimes does it connect to my network that I have told it to automatically connect to. i know that i have a great connection with my network because my router is in my basement about ten feet away from where my mac is. It used to work perfectly. Anyone know why this would be happening?