My new Desire was delivered Monday evening. It is on the 3 network. Have a great signal at home - H. Took it to work for the first time yesterday and had a great signal in my office too. I'm also getting H there most of the time, occasionally it drops to 3G but only for a few seconds then goes back to H. Internet browsing is fast and smooth. So far so good then, I went downstairs however and noticed that I had no signal. How can it go from the strongest possible signal upstairs to no signal at all downstairs?