Try factory resetting the phone .
This can be done through Setting - Factory reset .
Please save all the data .
IF this doesnt helps , try updating the software version of the phone by goint o setting - update firmversion . But this may result in losing your Operating system of the phone . So try only with
Nokia Software Updater .
Or if the Phone hangs on a very frequesnt basis try giving it to NOkia service center .
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