Nokia 3110c — Firmware not good

Sir I purchased nokia 3110c on 9th jan 2009, from then i must have visited nokia care center 4-5 times regarding by firmware issue,I told them why are they not providing better firmware for this model. Everytime they reinstall n give the firmware it works fine but within few days it again goes corrupt and music file not found, bluetooth problem occurs etc. I m fed up of all this. Please provide me with some solution.