Fret Buzz

[rv_bass]

Hi,
 
I have a four string Orion bass.  Yesterday the E string started buzzing on the 5th and 7th frets, never did that before.  I couldn't figure out what was causing it, the frets look fine and not worn that much, the string (Pyramid flat .105) is only about a month old and looks fine as well (not worn out).  So, I changed the the string to a Pyramid flat .100 and the buzz has stopped.  Just wondering if anyone might have a thought on why the .105 buzzes and not the slightly lighter guage .100 string.
 
Thanks!

[keith_h]

If your setup has the neck fairly straight and low action the increased diameter of the string could be just enough to interfere with the frets. Anytime I change the string type or gauge on my guitars and basses I always go through a setup procedure to account for the changes the strings introduce. This is also the time of the year I start into my seasonal adjustments due to the increase in humidity that starts to reswell the wood in the neck.  
 
Keith

[rv_bass]

Keith,
Thanks very much for your comments.  I'll work on the set up to see what effects that has.
Thanks,
Rob