Mobile hanking

I am using rog2 8 gb ram.my mobile was hanging per day 10 or 15 times and restart my mobile. Particularly i spoke cl after mobile was hanging.kindly send the solution... after cut the call mobile was switched off or hanging no display any..it was blank...
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Factory reset your phone. If it doesn't help, then send it for repair
I already do this but not resolve
Then visit to your nearest service centre they will assist you better.
Near by no authorised service centre