Graphic glitches when Sound Note plays - Top Loader NES

I was wondering if you could guide me with an issue I have with a recently acquired top loader NES. In some games, (SMB3 is the one where I noticed it) when a certain note plays (in the music in this case), garbled graphics will flash on screen. Do you have any idea why this happens?

Here´s a short video to show you, please notice the weird sound that makes the glitches appear. (This glitch won´t appear on some games, that is why I did not notice it at first, maybe it appear just when that particular note is reproduced...)

https://youtu.be/CUFI3ezziV0

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