What software update did your S21 Ultra update to and what carrier are you on? (Settings > About Phone > Software Information > Build Number (last 4 characters))
Does the moisture notification trigger when you plug in the device or just randomly?
Hello, I can see how frustrating this is for you. Your device has a LDI (Liquid Damage Indicator) strip inside its SIM or SD card tray that changes colors when your phone or tablet has been exposed to water or other liquids. If you suspect that your device has sustained liquid damage, you can easily access the LDI with these steps. Check this article out and try the steps in it: https://www.samsung.com/us/support/troubleshooting/TSG01001077/. This one as well: https://www.samsung.com/us/support/troubleshooting/TSG01001449/ If these do not resolve your issue, please let me know.
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