Haroon Sid

Hello, now a days i am facing a problem with my Lava Iris 504q+ when i call to any number, after recieving call, my call going to disconnect automatically after 3 to 5 seconds. when i redial the number again the call timer start with where the first call disconect automatically. i am getting this error againg and again plz help any one and sorry for the poor English thanx