EmmettC, This is most likely a cable system problem but a bad TA can't be ruled out. If it is indeed just your SDV channels that go missing, you should also be power-cycling your TA while you reboot the TiVo. In TA Diagnostics, in the first status section, what are the dBmV values for FDC and RDC? Your OOB (out-of-band) control signals used to communicate with the cable system may be too weak. There is a way to tell whether a channel that has been successfully tuned is SDV or not, in TA diagnostics in the SDV SESSION section. Look at the SESSION with a frequency matching what DVR Diagnostics gives for the channel of interest. Then look at the "SamSvcid/Type:" entry. If the last portion of this value is "Switched", it's an SDV channel. Also of interest is the "Sub Expires" value in the PowerKEY Information section. It should be a date several weeks into the future, but definitely not "Expired", which means your TA has lost authorization. This usually results in an 8-blink-pause sequence of the green light. For my first year with a TA, I had to call support every month because the system wasn't automatically refreshing that expiration date. All the above applies to Cisco TA's. Not sure about Motorolas. The customer service reps have a "Customer Balancing" screen and if your account is set up properly (sometimes a big "if"), all they have to do is hit the "Enter" key while in that screen to send all the required signals to properly authorize your TA and CableCARDs. On a couple of occasions I actually instructed the rep to do this, while their only solution was a truck roll.