Platform-specific support
Samsung Galaxy troubleshooting
One UI problems on Galaxy phones and tablets: moisture warnings, S Pen faults, storage that fills after an update and battery drain, with the Samsung-specific settings to check.
Galaxy phones run One UI, which adds Device care, Samsung Members diagnostics and several battery and performance settings. Start with a restart, then Software update, then Device care, Optimize. After a major One UI update the phone spends days re-indexing and optimizing, so battery use, heat and storage can look worse before they settle; Samsung's own answers recommend waiting up to two weeks before resetting.
Galaxy moisture warning will not clear
The moisture/debris warning blocks wired charging to protect the USB port. Drying naturally and testing another cable is safer than heat, compressed air or inserting objects.
Open record Samsung Galaxy · S PenGalaxy phone or tablet does not detect the S Pen
S Pen detection depends on model support, tip/proximity behavior, magnetic accessories and—on Bluetooth models—charge and pairing. Screen writing and remote actions are separate tests.
Open record Samsung Galaxy · biometricsGalaxy fingerprint sensor behaves incorrectly or produces the wrong result
Open record Samsung Galaxy · biometricsGalaxy fingerprint sensor is not working
Open record Samsung Galaxy · biometricsGalaxy fingerprint sensor is unusually slow or delayed
Open record Samsung Galaxy · biometricsGalaxy fingerprint sensor keeps disconnecting or working intermittently
Open record Samsung Galaxy · biometricsGalaxy fingerprint sensor stopped working after an update, outage or hardware change
Open record Samsung Galaxy · biometricsGalaxy fingerprint sensor works only on one app, network, account or location
Open record Samsung Galaxy · DeXSamsung DeX desktop mode behaves incorrectly or produces the wrong result
Open record Samsung Galaxy · DeXSamsung DeX desktop mode is not working
Open record Samsung Galaxy · DeXSamsung DeX desktop mode is unusually slow or delayed
Open record Samsung Galaxy · DeXSamsung DeX desktop mode keeps disconnecting or working intermittently
Open record Samsung Galaxy · DeXSamsung DeX desktop mode stopped working after an update, outage or hardware change
Open record Samsung Galaxy · DeXSamsung DeX desktop mode works only on one app, network, account or location
Open record Samsung Galaxy · privacySamsung Secure Folder behaves incorrectly or produces the wrong result
Open record Samsung Galaxy · privacySamsung Secure Folder is not working
Open record Samsung Galaxy · privacySamsung Secure Folder is unusually slow or delayed
Open record Samsung Galaxy · privacySamsung Secure Folder keeps disconnecting or working intermittently
Open record Samsung Galaxy · privacySamsung Secure Folder stopped working after an update, outage or hardware change
Open record Samsung Galaxy · privacySamsung Secure Folder works only on one app, network, account or location
Open recordTroubleshooting a Samsung Galaxy phone
Samsung Members, Support, Phone diagnostics tests the touch screen, battery, sensors and speakers, and gives you something specific to quote to support. Wiping the cache partition from recovery clears temporary system files without deleting your data and is a common step after an update. Models differ: the S Ultra phones have an S Pen, and the A series has different update schedules, so use the page for your model.
Several Galaxy problems are caused by settings that are specific to Samsung. A Moisture detected warning stops wired charging until the USB-C port is dry, so dry the phone and port, leave it unplugged for a while and use wireless charging if you need power. Late notifications are often caused by battery optimization, which Samsung applies to apps that you rarely open, and the fix is to set the app to unrestricted in Settings, Apps, Battery. A storage warning can be caused by the Recycle bin in Gallery and My Files, which keeps deleted items for about 30 days.
S Pen faults on the Ultra models are a separate matter, covered on their own pages, and Samsung Members' phone diagnostics will test the S Pen, the touch screen and the sensors. Updates arrive on a schedule that depends on the model and the carrier, so check Settings, Software update on a regular basis.
How long should a Galaxy take to settle after a One UI update?
Samsung's forum answers put the optimization period at up to two weeks; judge battery and heat after that.
Why does my Galaxy say moisture detected when the phone is dry?
The USB-C port may still be damp or have lint in it. Unplug everything, let it dry for some time and use wireless charging meanwhile.