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Ensure that your WhatsApp application is up to date. Sometimes, outdated versions can cause such issues.
A simple restart can often resolve many software-related issues, including those with WhatsApp.
On Android: Navigate to WhatsApp in Settings > Apps > Storage, tap "Clear Cache" and "Clear Data." Back up chats first. On iOS, users can reinstall the app.
Poor network connectivity can cause WhatsApp to log out unexpectedly. Make sure you have a stable internet connection.
Ensure that your phone's operating system is updated to the latest version available. Sometimes, compatibility issues arise with older OS versions.
Insufficient storage space on your device can also cause WhatsApp to malfunction. Make sure you have enough free space.
Certain third-party apps or settings might conflict with WhatsApp. Try closing any unnecessary apps running in the background.