My house was struck by lightning about a week ago. We lost cable TV and a cable modem along with a cordless phone. My entire home theater system checked out fine the next day, however... I now hear a very low (probably from the sub) single "thump" whenever I execute a command on the DVD player. It could be selecting something on the disc menu or even shuttling back and forth through the movie. It's not very loud but it is a minor annoyance. Other than that everything works tip top. Anybody have any idea what the issue might be?