iPod touch 5g speaker faulty

I bought my iPod touch 5g in late February and after about a month my speaker started to stop working properly. As soon as the volume hit just after half way the sound would start to buzz and fizz, this really scared me so I then used it only up to half way. I thought it was only going to be a one off thing and would go away but it is now 7 months later and still fizzes and buzzes when I put the volume up high. Is it possible to fix?