OMG Please Help Volume goes up and down and mutes when making a call

I have a 8320 with the newest OS installed. When i press the send button to make a call the volume goes up and down and mutes. Same things happens when i'am initializing a voice dial. Happens both when i listen by speakerphone and normal listening. Only time that it does not happen, is when i listen to the ring tones. Phone was working fine til one night with i listened to music all night with a ear phone pluged in, I unpluged the ear earphones, and for some reason, it started with the volume up and down and mute issue, Come guys and gals, somebody out there has to know what went wrong and if its fixable BTW i bought the phone like 2 years ago

do a battery pull, phone on pull the battery out and replace in thirty seconds. do a test call to your v-mail or something, and that should fix it.