I have a new ATV (1080p) hooked up to my wireless network. It was working perfectly until today. All of a sudden it's taking a long time to download/stream content. For example, I just purchased a new episode of a TV series, and it says "Ready to play in 23 hours". There doesn't appear to be anything wrong with my network. I have two computers connected via Ethernet, and an iPad and iPhone connected wirelessly, and they're all fine. Did a speed test and am getting 30 MB/s down and 5 MB/s up. Any ideas? How do I troubleshoot this? I've power-cycled the modem and router three times, to no avail.