Last night I jammed for about 2 hours with some blues musicians who asked me to tune to Eb, Ab, Db, Gb. When I got home I tuned back to E, A, D, G and I had fret buzz everywhere, all strings, except the higher frets. It's a Squier VM 4-String with Fender Tapewounds (which got alot of looks). So why the fret buzz when I tuned back up a half-step? Would tuning down for 2 hours cause that much change in the neck? If so, and I decide to jam more with these guys, then how can I keep from fret buzz with both tunings? Thanks for any help.