The reset (removed memory card, quick double click of on/off button) did not change the problem of the shutter button not working 95% of time. Back to the drawing board.
Have had the S100 the end of Sept 2012 and it worked fine until the end of October 2013 (the month after the warranty expired), then the shutter button problem started. The problem is really bad now with 95% of the time the camera will not take a pi...