Work through these checks in order
Open other apps. If many apps fail, storage, system software or device-wide conditions may be involved.
Restart the device, then check for normal app and operating-system updates.
Very low free space can cause update failures and unstable app behavior.
A new login, permission change, VPN, keyboard, accessibility service or beta update can affect an app.
Some apps store local data that is removed during uninstall. Verify cloud sync or backups before reinstalling.
Before an erase, restore or repair decision
Confirm what data is backed up, what a reset or restore will remove, and whether you still need access to account credentials or authentication methods stored on the device.
When professional service makes sense
Hardware damage, repeated power failure, liquid exposure, battery swelling, damaged ports, broken displays and problems that persist after low-risk software checks can require qualified inspection.