Sounds like your strings are catching on the nut. Take a small file and enlarge the grooves slightly (about 1/2mm.) Get some graphite powder lubricant and mix a small batch with Vaseline and put in just enough to cover the groove. Tighten up your strings then wipe off the excess and you are good to go. If you do this right you will never be able to tell anything is different.
Find an online guitar forum. There are lots of things you can do to help keep your guitar in tune.
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Sounds like your strings are catching on the nut. Take a small file and enlarge the grooves slightly (about 1/2mm.) Get some graphite powder lubricant and mix a small batch with Vaseline and put in just enough to cover the groove. Tighten up your strings then wipe off the excess and you are good to go. If you do this right you will never be able to tell anything is different.
Find an online guitar forum. There are lots of things you can do to help keep your guitar in tune.