Philips E-Box FTR9965 DTV Receiver "soundbar work sound tv" Questions

...soundbar, and it sounded like the TV was channel surfing. Weird. We called Philips and they referred us to a repair guy, who took the TV home with him. He brought it back a week later, and it worked ...

soundbar, and it sounded as if the TV was channel surfing. Weird. We had a Philips tech guy come out to try to fix it. He worked on it a week, brought it back, it worked for 5 min, then same scenario.