whenever i use my phone wi-fi for few days without restarting phone not even once, it starts giving prolems. after few days of continuous use(i.e. turning wi-fi on when needed and then turning it off) it doesnt't turn ON. it shows "error" written in wi-fi menu...den i've to restart phone to use wi-fi again...and at that tym bluetooth also doesn't turn ON. does anyone know how to rectify this prblm???