Last week my iPhone 3G stopped being able to find my house wifi. It finds and uses other networks at restaurants and friends' houses, but not my house. All the computers that use the house wifi have no problems. I've tried restarting, syncing, and restarting again, but no dice. Sometimes the network name pops up, but it just won't connect. Other times it doesn't even show up. My girlfriend's iPod Touch finds the network and joins it, but then it doesn't actually work. Any ideas?