I purchased a 50" Philips plasma about 3 weeks ago. When changing the channel i will hear a loud crack or popping sound. Also sometimes when watching a show i will hear a loud cracking sound from the speakers every once in a while. Much louder than the volume of the TV. It is not the cable box since it will do it with the cable feeding directly into the TV. It will also do it when the TV is first turned on. Any suggestions or comments. I still have time to return this TV if it is a problem. Thanks for any feedback.