If the app is freezing please do these things to fix the issue.

Restart the app. This requires you to kill the process not just minimizing and reopening the app. This fixes most issues.

If that doesn't fix the issue, try restarting your phone. 

If that doesn't fix the issue goto the More tab and write down how you logged in. It'll show your email and if you've signed up with Facebook or Email. Then uninstall the app and reinstall it. Remember your data is stored on our servers not your phone, so uninstalling does not erase your data. The only way to access your data is to login to the same account as before.

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