Hi I am having a tom Tom Spark with cardio and music option. I use a Mac OS. The watch was doing fine for first six months and all of sudden it is not getting detected whenever I connect to my laptop it is not getting detected and after few second the normal watch display comes on. I have reinstalled the tom tom my runner app it didnt work. I have reinstalled the mac os but no joy. I sent the watch to service center and received it back after three weeks but once agin its the same issue again. With this problem though I can sync and download my activity data through i phone but i cant cahange any playlist on my watch. Please advice the solution to this problem.