My phone restarts

I have a Galaxy note 2 n7100 and it restarts randomly usually when it's in my pocket and I have some battery issues I have already tried to flash another ROM but it's not working some times it shuts down and don't turn back on again until I pull the battery out for sometime and put it back again or when I plug it to the charger is it possible ti be the battery problem ? or another hardware problem ? Note: when the device in the charger it works great with no problems

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