"Adam Russell" wrote
Could it be that the guest bathroom shower is not used as often? In other words, is it only used when you have guests? I had the same problem in my last house. Not sure if it's because the inside of the pipes (and the water sitting in them) gets "stale" without regular waterflow or not, but that's they only thing I could come up with. Either that or you have smelly guests.....
;-]