Lately my (less than 1 year old) Airport Express has been giving me a great deal of trouble. I have both a main network and a guest network set up, and in the last month or so, the main network shows no problems, but is not actually connected to the internet. All of my iOS devices, my Apple TV, and my iMac show it fully connected with no issues, but not a single one of them can access the internet when connected to this network 99% of the time. When connected to the guest network, I have almost none of these issues. I pull full speeds over at speedtest.net, and using the app on my iOS devices. I'm not really sure how it could be an issue with the router if one network is working and the other is not, but I'm pretty uneducated when it comes to networking. Also: my iOS devices have no problem staying connected to the guest network unless I tell them otherwise, but my iMac tries to go back to the main network EVERY TIME it goes to sleep and wakes up again. Any way to fix this until I can get the overall issue resolved? I know the Express isn't quite as powerful, but I've been using it for a year with none of these issues, and even when in the same room as the router the main network still gets nothing. So it's not an issue of distance from the router. I'm sure the answer to this question is going to be "call Apple", but I thought I would ask around here out of curiosity. Has anyone experienced similar issues, or have any easy fixes to offer before going the replacement route? I really can't be without internet for the amount of time it would take to get a replacement in the mail. Edited to add that Airport Utility on the iMac does not detect any issues with the main network (and won't recognize the router at all on the guest network), and pushing a firmware update to the Airport Express via the utility did nothing to fix the issue.