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The symptom you are describing could be one or two things, if it works for a while then starts to act up this coulb be an indication of a bad solder joint. But it may also be the CRT or the picture tube. Try tapping on the sides when it starts to act up while watching the picture to see if it clears when its tapped on. If it does then you have cold solder joints on the main board, this is a easy fix. IF it does'nt then I suggest you contact your store for warranty info to have the CRT replaced or the television exchanged. Since its still under warranty you might as well use it before it expires...
I had a Crummy Westinghouse TV that had a problem like this. JVC's are typically better built then a Westinghouse. My first educated guess - sounds like it's a voltage issue, most likely on the high voltage. Probably a capacitor on the power supply side of the motherboard or the capacitor in the flyback transformer. Just and educated guess.
Lets try something ,turn the set on and put you forearm in the face of the picture tube if your hair stand to static it means you have high voltage and your set is missing possible the screen or filaments volts,if the hair in your arm does not stand your set is missing the high voltage and the problem is related to the flyback but it does not mean is bad ,it could have a loose conection in one of the legs or in the near area,next time it happens tap on the side of the set to see if it reacts if it does you know you have a loose conection.If you are familiar with tv service this will be a good place to start but if you are not too familiar be safe and call for assistance from a servicer.Let Us know if you need more information and how it goes.