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settings>apps>gmail/chrome>clear data
does the crashing happen when you are in safe mode?
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/td-p/348008
if the crashes stopped while in safe mode, it means there is an app that is acting up and might be conflicting with your other apps. try to review your downloaded apps
if it still crasing, you can do a software repair using PCC