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You should make a very small investment in a fret rocking tool, which is basically just a straight edge that covers three frets at a time to see if your frets are level. If your instrument has been subject to a dry environment then the fretboard has shrunk a little (and we’re only talking about a few thousandths) and what will happen is the fret wire will raise out of their groove, since they are only pressed in. As far as the “set-up” link, I would stay away from lemon oil to lubricate your fretboard, it contains acids. Check with your guitar manufacture to see what they recommend to clean and lubricate your fingerboard. The good news is, whatever the issue is, it can be repaired. Like others have said, find yourself a good luthier in your area and have he or she get to the bottom of it…..good luck!