Why is my amp making so much noise?

i have had my amp for basically a year now. it is a peavey VK212. and recently (past 2 months) it has been making alot of noise where it did not before. it sounds like there is a really strong wind blowing in my amp and a lot of crackling. none of this was there when i bought it. i am aware that alot of amps do make some background noise. and i can still hear that, but these noises are new. what is wrong with my amp and how do i stop them?