Has anybody here had problems running the TC in 5GHz mode, or is everybody having good success with it? I need to know before I go buy an Airport Express to try and add a b/g network. I tried one time to set my TC into 5GHz mode and it locked up on me; I lost wireless & ethernet, the status light stayed green, but Airport Utility couldn't find it even though I was connected by ethernet directly to the TC. I need to know was this just a fluke or is TC problematic at 5GHz. My TC is currently set back to the default of b/g compatible mode on channel 9 and everything seems to be rock solid. Am I going to make things worse by changing the TC to 5GHz and adding an Airport Express?