Just wanted to confirm that this is a known issue on the 1.70 firmware (and 1.24 on the HXDx90 series). It shows up in two different ways: the one that was described here (channels tuned and than lost), the other is the recorder stuck with "Update" on the display forever. In both cases a factory reset solve the problem without loosing anything on the hard drive. It's annoying but can be worked around.