Fender Ultimate Chorus Problem.....Listen to audio files

[kozmo]

I have an ultimate chorus, when I turn it on it plays fine but after it warms up I start to hear a crackling sound when I pluck the strings. I've checked speakers-ok, it's not the guitar-new,plus It does the same thing with another guitar. It only does this AFTER it has warmed up, usually about 5-10 minutes after powering up. Any idea guys? The first two audio files are with my guitar, the third audio file is with my ipod hooked up through the amp.


http://youtube.com/watch?v=tipKqO_bkig

http://youtube.com/watch?v=iyTTFtGNaBE

http://youtube.com/watch?v=Q_ZI069rXnQ