My first 151 had some of the symptoms you describe so I returned it for another. The second 151 worked perfectly but had a power supply whine that I could hear from across the room, so I returned that one and ordered a Zenith 520 STB (Directv/OTA). The Zenith has none of the issues that both the Sammys had and it's been working perfectly for over 2 years. I wish my new HDTivo was as good as the Zenith, it's close but still has a few minor little characteristics that make it not as good