[Resolved]  HTC — charging & software

hi...
i bought htc p3400i six months back, after 2 months is started battrery problems...at the time of charging it shows certain percentage of charging and when i use it the battery the automatically gets increased...today i recvd my frens call...after receiving the call automatically its speaker started working...many times i turned speaker off but it didnt worked...after that call i recvd the error msg...
what should i do now...