I'm finding that I'm losing the wireless connection with the Roku 3 rather frequently, and consistently. In fact, every time I start using it for the day, I have to reconnect.
It's worse if another Roku (older, first gen) is being used on another TV. Supposedly I have 6Mbps download connection speed, and I didn't have problems with first gen Rokus (though I did have some issues with the Angry Birds Roku box).
I can see buffering, but I shouldn't be losing the connection. No, I don't lose it with any other device, or with the older Rokus. So this is a new Roku 3 problem.