samsung Galaxy Grand help needed
 

please any expert help me.
i have problem with my own cell.
5 days ago i purchased new galaxy grand.
before it i had grand too but i sale due to same problem.

some time its ringer sound come from
earpiece till i hard reset it.
after hard reset ringer ok.
its my second cell with same issue.

please guide me is there any setting
or some other trick.
it is difficult to hard reset after every 5 days.


Thanks

once do update with spt box or odin then chek it