Sony India — Sony xperia 2302 model frequently automatically shut down complaint

Address:

533004

I have purchsed sony xperia d2302 model 8 months back. two months back phone automatically shut down.service center change mother board. again after one month same complaint .Again service center changed mother board. Now on 24th december again same complaint and submitted to service center. they take complaint against service id no.[protected]. I think there is some manufacturing defect. Please change my mobile set.