I have never used the auxiliary in before, until yesterday. I have a 2-male RCA -> 1/8" male adaptor pluged into the aux RCA cable. I pluged the 1/8" into my iPod Shuffle just to test it out.

The result was rather strange. The song was coming through very jittery. I'm not sure how else to describe it. It was off and on all over the place. I changed tracks on the Shuffle a few times, and when I did, the song would come in fine for the first 2 seconds or so and then start to studder all over the place.

I checked the integrity of the the RCA connections and all seems to be fine.

Any ideas as to what's going on?