Hello, I have recently installed an a/v system at a customer's house. All of the TV's in the house are Samsung LED. Directv came out and installed 3 H23 receivers and a HR24-500. They also did the whole SWM setup using a 8 way SWM splitter, DECA1MRO-01 units on the 3 H23 receivers (HR24 has it built in I guess). All of the receivers are located in a central a/v enclosure and transmit via HDMI baluns over cat5 throughout the house. With that said, the problem is that every time someone turns on a light switch anywhere in the house, the HR24 cuts the picture for 5 seconds then comes back on. This only happens with the HR24 and not the H23's. This is not an electrical issue since the house is brand new and I am the electrical contractor who wired it. The a/v enclosure is powered by a TrippLite IsoBar 12 outlet surge suppressor/line conditioner( it's the one with a digital readout of voltage and amperage on the front). I have tried every scenario (different phases, different tv's, different circuits) but nothing helps. The customer contacted directv and had a replacement HR24-200 sent out. I swapped it and now the problem is worse. Do you think he should switch to an older unit that is less buggy (HR23-700)? Please help, I am at a dead end and Directv tech support won't help. If you need any more info please let me know. Thank you very much.