I cannot synch my Approach S4 to my iphone. It worked a week ago and now gives the error message when I try to synch, "Forget S4 on mobile device". I have tried uninstalling the app on my phone an uninstalling the device on Garmin Connect, and reinstalling without success. Is there a storage limit on the S4 I may have reached and requires deleting data too? Is the problem synching or storage or both?