I had this same problem for a few days last month and was scratching my head trying to figure out why it was happening. I saw the solutions for clearing the cache and powering off the phone and thought worked and then a day later it returned. Then I noticed something that I was doing that was causing the problem. When I was using my phone for a period of time I noticed that as I was holding the phone one of my fingers was resting along the bottom of the phone and was blocking the phone charging port. This would trigger the moisture fault message. After this I became more conscious of where my hands were when holding the phone. The problem went away for 2 weeks until a few minutes ago when the moisture message came on and I looked and saw my finger blockibg the port. I moved my hand and after 5 minutes the message went away.
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