I have 2 DVRs, one HDDVR model 22 and another SDDVR model R16. The 22 works fine. The R16 is flaky. I have a SWiM setup. Symptoms are that I set the DVR to record. When I go to watch the show, it DVRs some portion and then the channel switches to another channel. I hear a stutter and then I realize the tuner switched what it was recording! No other program was set to record. Also, while the unit is turned off at the front switch, when I turn the unit back on, the channel I am on works, but all the other channels are blank. I can change the channels, but it is as if there is no tuner to display anything but the one channel. Sometimes no channels work. I reset the box and it works for a few hours. I ran tests when it was screwing up and notice not signal on one or both tuners. I then ran a test and get an error 49-147 "Primary tuner connection problem. No SWM channels are available. The receiver is unable to register tuners for live TV or recordings because there are too many receivers connected to the coax network". This is my first big clue. This is a replacement unit. The other unit was doing it, service came out and replaced the box and the remote. I am now suspecting the cabling or the firmware since two same model boxes are doing the same thing. The dish is on the roof and the cable runs to the junction box (SWM distribution box?) and then the cables run up to my attic and down the walls into 2 rooms on opposite ends of the upstairs of the house. The offending unit is closer to the SWM. Both the HD box and the SD box have just the one coax running into the back. This is only 4 tuners. Help!