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Restart
Restarting your Xperia will close all open apps and flush the memory. Apps will run faster and smoother and there will be more memory available. To restart your device long press the power key. In the menu that opens, tap Restart.
Safe mode
Check if a third-party app is causing a problem.
Update
The quickest and easiest way to solve many performance issues.
Software repair
Solves issues with an unresponsive device, or a forgotten screen lock.