I've replaced the strings on my old electric guitar for the first time in, I think, 5 or 6 years. In that time, I haven't played my guitar at all.
Now, when I put on new strings yesterday, the sound was pretty clear and bright. Today, they're already quite dull and almost sound 'muted' around the 15th fret. Mostly the 4th string.
I don't know what strings were on the guitar, it's Earnie Ball regular slinky now, though.
Any ideas what could cause this?
Full disclosure: Haven't listened to it through an amp as I don't have one around right now.