I just bought a myphone A878 android mobile phone, suddenly wifi connection can not turn ON it always goes back to off then in advance settings it is written there that IP and Mac address are unavailable. same as bluetooth always off. pls. help, I just use this android mobile for 3 weeks all working, but suddenly this wifi and bluetooth are not working aymore.

Are you running a "Task Killer", or another like app, that might be a little too keen and killing system processes for activating these services?

Have you considered a factory reset? That might fix the problem by ensuring the removal of any app's that may be causing the problem and set your phone to default settings.