I can't think of anything more annoying than a guitar that has a recently developed buzz.
Buzzing can be many things, like pour chording, which may arguably be the easiest to fix. Other issues might be due to uneven frets or a warped neck and finger board. But on my last repair ticket I encountered a Rube Goldberg type chain reaction.
First thing I noticed was that the neck had significant bow to it, which is quite typical of older guitars. So naturally I started my repair by adjusting the truss rod to bring the neck and frets back into a single plane, which worked like a champ. But the issues with buzzing had just began with the G string. The buzz was happening with the string making slight contact with the first fret. Apparently, previous repairs had happened on this instrument to correct the tall string action (which might have been remedied with a turn of the truss rod nut), both the nut and saddle had been cut down. So a new nut was filed and the old replaced. Once the new nut was milled down to get the action measurably perfect (LowE .023"@1st HighE .013" clear), the annoyance was gone.