I have the same issue and it is very frustrating. I have reset the phone to factory settings, powered up in safe mode and even gotten a replacement phone from Verizon. Issue persistes. However, here are some things that I have tried and they seem to work (sometimes). 1. Go to your Apps, 2. Push the three vertical dots on the right hand side 3. Push "Show system apps" 4. Scroll down to "Android System" and push the icon. 5. Push the "Force stop" Icon. The moisture error alert indicator should dissappear. 6. Restart your phone. 7. Attempt to charge or connect to your computer. (5 out of 10 times this works) Second resolution: 1. Do steps 1-5 above. 6. Restart your phone but when the "Samsung" appears, insert your charger and let the phone power up. (This has been successful about 80% of the time using this method. Third resolution: Do steps 1-5 from above. 6. Turn off your phone. 7. Attempt to charge your phone when powered off. (This has worked 100% of the time for me if I can't get the other solutions to work). If you are transferring files from your computer to your phone such as pictures, videos, music, etc. I use a bluethooth connection between my laptop to my phone. A little slow but functionable. My biggest issue is that I use Android Auto through a USB connection in my truck. I have found that if I don't disconnect the USB cord before I turn off the truck. The alert shows up. I am pretty sure this has to do with the interruption of power from the truck to the phone. Again, I think this is a software issue that Samsung is overlooking. Good luck.
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