I have a pair of Velomax Circuit wheels with only some 200 miles on them. As you may know the Velomaxes (as well as some of their other models) have extremely quiet rear hubs. The clicking sound when coasting is barely audible. Recently, all of a sudden that clicking noise has become much louder; loader than my Ultegra hubs.

Does anyone have any experiences with this or suggestions what may be wrong and what I should check out first?