I have a Comcast 20 Mbps cable Internet plan and noticed recently that my download speed had dropped to 2 Mbps. I called Comcast and we figured out (by hard-wiring from the modem to my Air via a Thunderbolt adapter) that the problem was not my Internet service but rather my Time Capsule. It's a first-generation and I am thinking that perhaps its wireless signal is dying. Is there some way to confirm this? Is there a way to know that it is my Time Capsule rather than my Air's wireless, without taking my laptop elsewhere to check the speed? And if it is my Time Capsule, is there some way to fix it so I don't have to throw it out? Thanks.