The “moisture detected” warning on Galaxy devices is a safety feature that can sometimes get stuck due to a software glitch, even if your phone is bone-dry. If you’ve already tried the obvious (shaking it out or waiting for it to dry), here is how to handle the “bug” version of this error. 1. Clear the USB Cache (The Most Common Software Fix) Often, the system app responsible for monitoring the port gets “stuck” in an error state.