Motorola / V3I Razr — the phone hangs every now and then

I bought motorola V3i Razr a year ago. From the past few days it has been giving strange errors like "Check SIm". Initially i thought it was giving this error perhaps because it had fallen on the ground once and some part of it would have got loose but no it gives this error even if the cell is kept untouched. my cell warranty has already expired, so, i guess i will have to go to some local shop to get it working again. But motorola sucks for sure.