response 13 of 13:

Jul 24 06:08 UTC 2002

resp:11  More than likely, yes.  Many flat-top guitars with steel 
strings have rods in the necks to retard warping, and it may have been 
more resistant than the nylon-strung one, especially if such a nylon-
strung one was a classical.

Strings can stay out of tune if they've gone false, i.e. they're worn 
out.  Copper-wound bass nylons strings (4, 5, 6) are more prone to this 
and you can buy sets packaged in counts of 9 (3 extra basses).