Samsung TV's have Anynet+ (also known as HDMI-CEC), a feature that allows connected external HDMI devices to inform your TV when they have turned on. All you need to do is to unstick the stuck button and the TV will stop changing channels by itself. Sunlight: The infrared receiver on your television has a filter on it that keeps it from picking up the … Your TV might be running in store demo or shop mode, where after every 30 minutes TV's picture and sound settings returns back to factory default settings. Maybe a channel-switching button (e.g. If there is an issue related to sudden change in Picture or Sound settings.You need to check the usage mode of your Samsung TV. By default, the TV will immediately switch to this source when this happens. Cover the remote control's front edge (the IR sensor) to check if the TV will stop changing channels. the channel + or - buttons or a channel-number button) on the remote control or on the TV itself is stuck. The method to stop the TV from switching the source varies depending on the type of remote you have.