Is the temperature where the guitar is constant?
[quote=Joe Videtto2]<...snip,...> I find that several of my strings often become sharp after the guitar sitting for a day or two - not all, but I haven't really kept records.<...>
Well, I live in a house in NYC where we shut the heat off at night - so probably this explains it.
As long as the action doesn't dramatically change with temperature changes, I suppose I shouldn't worry about this.