hi frnd.. i had also that same problem when i m using a custom Rom 'Sense Rom by shara'. After doing many resets, Wiping, and installing 'sense Rom' again nd again, but prblms continue. Finally, i got [ROM][Stable][04 Jan 2012] Jet 1.1
in this website. I completely make my phone error free. and dont worry abt warrnty. Micromax service centre's engineers are fool. I have given my Andro to them in Rooting condition and tell them to install Stock ROM with full format. But they are not able to do that. they just reset and Format it. nd nt able to install stock ROM. so, just install this ROM. its a best CUSTOM ROM for Andro. Nd dont worry abt warrnty, ihve given my phone to them in rooting with a custom ROM installed. they are fool.