General I need help!! Rooted thunderbolt shutting off

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http://androidforums.com – I not sure if this has anything to do with the root!! HTC thunderbolt 2.3.4 i rooted my htc thunderbolt a few months ago.. the last few days ive had issues with my phone shutting off while im using it(with full charge). it does it every time. if your on the phone for more then 2 minutes it will shut off. if you turn it on right after it shuts off it will show the battery at 3-14%. if you wait a few minutes after it turns off then turnit on it will show the battery life at 45-80%.. It gets to the point to where it wont stay on.. If i put the phone on the charger it will work with no issues. (General)