SPE

I've had my ifi for about 3 months and it has worked great for that time. But now there is a problem. When increasing or decreasing the volume the music randomly comes out. It may be really loud or no sound at all. Its sporadic. It also happens when you change the volume on the remote. All the power and sound is sent to 1 speaker at a time sometimes or it all comes out of the sub and all you hear is explosive bass. It is really frustrating. All this occurs when changing the volume. Help!!