Safe mode won’t isolate the problem to a specific app, but if you don’t experience any issues in safe mode then there is a strong likelihood that one of your apps is the culprit. This function has existed for years, but many people are not aware of its existence in Android. We often receive emails asking for support with Xperia devices and this is one of the methods that we refer people to. Please see the below instructions on how to boot into safe mode.
Click here to read the rest of the article