not talking

Hi, my IRN is 3 yrs now. I have taught him plenty of things. He used to talk well and he would talk to himself in the mirror but now he has stopped doing that. He hardly speaks a word now. This behavior started when i left him for a week. He was not alone, he stayed home with my father like...

My parrot appears to have "lost his voice." He is making the same movements to chirp but no sound comes out or a little huffing noise comes out. Like a sigh. What does this mean? He can't talk or chirp. What causes this? He is eating, drinking and active like normal.