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A buzz in the sound usually indicates poor grounding somewhere or bad filter caps in the power supply. Lines moving up the screen used to be common in old tube sets, also indicates bad power. Have you opened up the back for a look?
If it doesnt happen when you change the channel or volume on the tv itself then i would recomend getting a new remote. You could probably get one on ebay. Most manufacture remotes will work on all of their tvs.
since you say you have had it just a short time call samsung and request service for your set this is a problem and will get worse if its just a couple months old parts are still in warranty and not sure of labor there is a warranty statment in the owners manuel
Go to the volume screen. Tap the buttons for louder and softer. If the volume indicator does not move then goto solution A. If the indicator does move but you do not hear the voice say "louder" or "softer" goto solution B.
A. There is a problem in your settings file. You need to reset these files to factory status. This will reset all your settings to factory default. From the main screen hit Options then hit Options again. You should see a button that says "set to factory" or something like that. Click that and then reenter your custom settings as you like. Problem fixed.
B. You have a hardware problem. Call Navigon support for repair options.
Set your SAT receiver to full volume and use your Sony TV volume control as the master volume control. If you use an external surround sound amplifier do the same thing using the amplifiers volume control as the master volume control.
Consider that all source devices that have the ability to control their output volume will output what they call line level 0dB when the source device is set for maximum volume. If you set the source device to 1/4 volume your output to the amplifier may be around -25dB or lower. Introduce that low of an audio level to the amp and you will have to turn the amp up to half way or better causing the amp to amplify noise too.
I am also having problems with the same year and model number panasonic, it is at the repair shop now. I think it is a lemon tv. won't buy panasonics anymore. Tried all the fixes recommended by panasonic. It happens after the tv is on for longer than 1/2 hour. It happens with dvds and different hook ups. my samsung is fine on all the same connections.