What strings were you using before you noticed this ?
Does going back to those strings eliminate this ?
If so , what is the difference in the strings ?
If this is your issue , it may simply come down to the extra thickness of a coated string or a heavier/thicker string that uses the same thickness coating .
Should this be your issue , a widening of the slot in the nut may cure it .
I would also make sure that there is no loose or foreign material in the nut slot regardless of size . In other words , I would make absolutely sure that the slot is clean .
I had this exact issue rear it's ugly head for me recently . Traces of nut material were still in the slot causing exactly what you are experiencing . Drove me nuts until it showed itself to me when changing strings .
Good luck and happy hunting .
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