If it skips then it is Broken! However if it has just gone quiet it is more than likely fine! Have you taken it apart and looked at it? would be the obvious thing to do if it is concerning you!? Firstly the correct spelling of the words "some", "which" and "roads" would be a better start to your post! Secondly if the bearings are clicking i would be worried! You do not seem to know what you are talking about. Bearings should not click!