Not so good

I transcribe office notes for doctors' offices. For some reason, my new 930 Panasonic frequently emits a high-pitched squealing noise. Very hard on the ears. I have to eject the tape or tap the foot pedal several times, sometimes stops it, sometimes not. My previous transcriber, same model, worked fine until I wore it out. I will be contacting the company although I bought it in July and did not use it until my old one developed problems so don't know what they'll do for me.