If you phone hangs, you can use some apps to clear cache. I'm now using LEO Privacy,Boost feature is very useful in this situation, and the apk size is very small, you can have a try. LEO Privacy Applock Boost Hide Android Apps on Google Play
Do a factory reset (this will delete all your data but it can help your problem) or install a cleaning software like Du speed booster or clean master.
I hope i helped.
DU Speed Booster Antivirus Android alkalmazsok Google Playen
Clean Master Android alkalmazsok Google Playen
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