Have you tried uninstalling and reinstalling the app?
Resetting your router?
Also having the same problem. Freezes during menu scrolling 100% of the time making it impossible to browse the listings. And during programs usually within the first 3 mins a 100% of the time, then randomly from then on.
i am having the same problems and it only seems to happen when im browsing any of the entertainment stuff and in that area when watching !! can watch a full film and have no problems at all seems to be connected to the entertainment side of the app on the 360. Found that rebooting the console makes it work for that program but if i watch something else after that there is a risk of it happening again, the freeze can come from anywhere between 1 min to 30 min after program starts.
I have a ticket opened and a complaint about this subject. I was told by staff that nobody else had said they were having a problem with this according to the boards. Clearly they wern't looking very hard. As people have mentioned freezes after about a minute or so then randomly, at it's worst 3 or 4 times during a 30 minute anime show. Netflix is fine, amazon prime is fine, my internet is fine. Reinstalling the app does nothing complaining to Nowtv also seems to do nothing.