Speaker crackling when not in use?

Ok, the speakers on this phone (D6603) were bad to begin with, crackly as hell from a month or so in, I've still got about 6 months of my contract left (2yr) and the phone is out of warranty.

So now the top speaker is making a static noise for a few seconds after I press most buttons, even ones that do not make a sound, or when the phone is on silent it still does it...

Is there a fix for this? I'm happy to replace the speakers, but would surgery fix this particular problem?

Thanks!