I have one Premier attached via a gigabit connection to my Wireless N Router (operating in 150Mbps mode), which is connected wirelessly to another Premiere with a Wireless-N adapter in a room about 20-25 feet away on the same floor through two walls.
Until recently, I would stream everything from my wired (living room) tivo to my wireless one without issue. After the Fall update, it seems like I'll be watching something , and halfway through it will quit. By that point, I'm in Bed and don't want to mess with it, but it takes about 30-60 minutes for the wired Tivo to regain it's connection to the point where I can stream. I can still browse the wired tivo's contents, but anytime I try to play anything, it just stays on a black screen and says it can't due to connectivity issues. I'm assuming I'm only browsing the other tivo's content because it has already been loading into my wireless tivo's cache.
Any ideas? Things were fine until a few weeks ago. Additionally, my network is operating in true N mode with no G devices on it. When I had the G wireless adapter, streaming anything other than cartoons simply didn't work. Once I got the N adapter, everything worked great until I'm guessing the fall update.
edit: should note, I only use static IPs, and when this has occurred, there has been very little other network activity.