What's that ticking noise in my speakers?

I left my 2 month old CDP and Intergrated amp on for half a day and played some CDs at different interval at fair to moderatedly loud levels. It all went well except for later of the day when I played "Live in Paris" by Diana Krall, at my favorite track 11, " A case of you", I started to hear some ticking noise that never heard of before at the tweeters ( both left and right). When paused, the ticking noise went away and put at play the audible ticking noise can be heard again . After inspected the CD and there was no sign dirt or scratch, I played the same track again , the ticking noise no longer there. What's with my speakers? Are the tweeters distorted at fair but not too loud level or Is my CDP acting up?