I recently acquired an Epiphone DR-90S acoustic. I've been practicing with it a whole lot, so I tune it only about once a week. Something I've noticed is, with the stock strings, the highest three strings never go out of tune. These are the strings I play on most, and I've been practicing bends on them, as well. Still, they don't go out of tune. Is it common for those strings to stay in tune well?
its a good thing.... you have good tuners.