sounds like the nut slots are too tight... or need cleaning out...
try lifting them upwards out of the slots to see if they bind.. run the edge of some A4 paper through the finer slots... some folks use a bit of graphite from a pencil to lube the slots...
have you put larger gauge strings on lately?... the nut might only be cut for 9's..
"by degrees the flood of music drove all speculations out of his mind. It was as though it were a kind of liquid stuff that poured all over him and got mixed up with the sunlight that filtered through the leaves."