Hi Olive, Thank you for your review of the Samsung 60" TU7000 TV. We appreciate you sharing your experience with hearing an odd sound coming from your TV when you change the channel. Abnormal sounds will have different causes depending on where the sound originates from. If your TV is connected to an external audio device such as a soundbar, please make sure that the audio cable is connected to the correct audio output and that the connection is secure. For antenna or cable connections, check the Signal Information. A low signal level may cause sound distortions. Go to: Settings > Support > Device Care > Self Diagnosis > Signal Information If the sound is coming from the back of the TV, the expansion and contraction of the TV's outer casing may cause a popping noise. This does not indicate a product malfunction. The TV is safe to use. You may also want to run a Sound Test by going to : Settings > Support > Device Care > Self Diagnosis > Sound Test For further questions or assistance, please contact Samsung Customer Support at 1-800-SAMSUNG (ask for TVs), available 8AM - 12AM EST, 7 days a week. For additional support resources, visit us on the Samsung website and click on the ‘Support’ link in the upper right corner of the homepage for: 1) Chat with Us/Product Help: To begin a chat or find solutions, choose ‘TVs & Home Theater’ and select your model & topic. 2) Register a Product: For access to easy warranty support, convenient opt-in to special promos and offers, faster troubleshooting and service, and quick notification of system updates. 3) Manuals & Software 4) Warranty Info 5) Contact Us ~ Samsung Solutions