I used the Netflix app on my XL4 last night to start a movie. It ran for about a minute and then locked up the Tivo, which was recording 2 items at the time. After another 3-4 minutes of non-responsive time, it rebooted on its own. The only problems I ever have with my XL4 are with Netflix. Thankfully, every other device in my A/V cabinet has a Netflix app, but this is definitely a buggy version that needs to be fixed.