Mine is having the same issue. After swimming it did not shut off the water mode, no matter what. Tried to reset it but the power button did not work. Have opened it to look inside and try to find something easy to fix but it´s hard to find the faulty part/component. So, without knowing which spare part to buy and replace it I guess it´s end of game for this piece of hardware. Not worth it taking to servicing since spare parts for this 5 years old watch are not easily available and/or might be as expensive as new watch.