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It sounds as if the skipping or cutting out, is symptomatic of a defective transmission stream.
Or, since a car stereo is in a very 'noisy' environment, perhaps the ground connection is defective.
That could introduce noise into the electronics, causing the glitching that you have observed.
So checking and cleaning the ground connection might help... but if you disconnect the ground for cleaning, it's fair to warn you that you might find the stereo needs a code entered, which can get difficult.