Didn't read everyone else's responses. Be sure the 16th fret is not loose on the end. If it is loose, and you try rectification before gluing/stabilizing the fret, then you will not correct your problem.
Also, the 15th fret could be loose. If you find 1 loose fret end, it may be a good idea to check for others.
Otherwise, the other fine members of this forum have given you lots to consider.
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Ned Milburn
NSDCC Master Artisan
Dartmouth, Nova Scotia
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