HTC — Restart Problem

I am Sowmya from Bangalore.I bought HTC desire from Chrome kormangala,Bangalore during the month of April'2013 but after three month suddenly restart problem occur So have given for service thrice at H T C service center (plot No.11/1, Pattalamma Temple Street, Off Elephant Rock Rd, Near AV Nursing Home, Basavanagudi, Bangalore, Karnataka, 560004 Ph No:[protected] but no use same problem is occurring after changing Mother Board.Even service provider informed me that after changing Mother Board if it is not working properly file the complaint. So treat this mail as filing a complaint and provide the new HTC desire V ASAP. Request you to replace the new one.