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Question: Sony MDR-RF970R hiss

I'm getting a white noise immediately after a signal (sound) comes to an abrupt stop. I dont notice it during music as much but dialogue or sudden sounds (gun fire) it's painfully obvious. If you were to graph the artifact it would have a very steep attack and a gradual decay lasting approx .5 of a second. I've tested it on different devices, locations, channels, all the notes in the manual tried. Do I have a bad product or do these particular headphone all have this problem?