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whenever you restart the phone again, the phone will boot normal and the lag will be bag, safe mode disable third party apps that you installed, which means you have to find the app that is causing this problem.
This is how to narrow it down
restart the phone > open the app drawer > swipe left to right > installed > uninstall app by app until you encounter the culprit
it could be a taskiller, antivirus, ram app, battery app.
Since you are new to Android, check this out
http://talk.sonymobile.com/t5/Software-Updates/Lollipop-New-Features/m-p/955490#U955490
It's a lot easier if you swipe on the keyboard rather than type, also go to into the keyboard settings and just check suggest words do not autocorrect.
As for the link above, are some features you might want to check later on