hello, ive started learning guitar 3 days ago with my new cordoba c3m, the guitar is great for beginners, sound and keyboard etc. everything cool. only problem is strings get out of tune after a short while, mostly the lowest 3 strings, they get out of tune by 1/8 to 1/4 interval, now the first night it was more than that but tonight they got out of tune a little less. im thinking is this going to get better in a day or two, will strings stretch, could there be a problem with my guitar, everything looks fine no deformation whatsoever, completely clean new guitar