Home Network Issue

I'm having a bit of an annoyance. I have a network using a D-Link Wireless Air Extreme G wireless router. I have a desktop connected via wire and a couple laptops running wireless. Well this started today, I keep losing connection for all 3 pc's. I have had to restart my router in order to get my connection back. This has happened to me 3+ times today. I checked for updated firmware but I have the latest update. I do believe its a router issue since I seem to get the connection back once I do a router restart. If anyone has any ideas or advice, I'd greatly appreciate it. Everything was fine until today. I got annoyed after the 3rd lost connection.