Hi,
I'd like to put in my experience. I've purchased a handful of these device, and connected them to a few TVs in our office. We seem to see about a 30 min time of perfect operation, then disconnect and unable to reconnect quickly after that. Even deleting the device and re-installing does not allow reconnect. We don't use this a lot, but so far the same scenario has happened every time. I hope MS figures it out and fixes it soon.
From reading here I'm thinking the MS adapter uses open frequencies that are unfortunately allowed to accept interference and trouble. I hope this isn't true. Because, otherwise this seems like a great device.