Well this is starting to sound all too familiar...😠
Took my Nike+ 42mm Series 2 for a swim two days ago, did a timed set, locked and ejected water fine, gave me all the right info and appeared ok... Awoke the following day to a mic not working. Ive done everything recommended in these posts from my own technical knowledge and following an hour on the phone to Apple Support in Ireland this afternoon (complete with a remote diagnostic), I was advised to book a engineer appointment. Strange however, the diagnostics came back all clear, suggesting (if the mic is part of the test platform) that there may still be water stuck in the mic aperture (my thoughts, not Apple).... So Im awaiting a Genius bar appointment rather than send the watch off to be 'Looked at.'
I wouldn't mind, but Ive only had it out of its box since 27th December. So far, it equates to about £35 usage per day before it broke... not the best Apple experience so far...😟