I have had the Alt-Barometer on my watched repaired twice by Samsung and now I have the same problem again about 3 mnth after they fixed it for the 2nd time. My watch is 18 month old. This time I tried to clean the area where the sensor is located and it worked for about 24 hours each time I cleaned it with isopropyl alcohol / water mixture soak for about 2 hours. This time I soaked it longer to see if I can get it cleaned out. I stopped subjecting it to water, like showering or the pool. I just wipe it off. The cleaning with IPA and water in a cup is the only time it got submerged in the last 6 months. I thought water wsa the problem. I would think if this were the issue Samsung would tell everyone and give us a method to clean the sensors. Does anyone else have any suggestions? I have cleaned my watch 3 times now and waiting this last time to see how long the alt-barometer app keeps working for.