recently bought a pair of rackets with full gut strung on them. the seller says the strings/string job are about 9 months old but with only a few hours of hitting on them. theyre currently strung with klip/wilson natural gut. my question is can gut go old or bad since its been so long. the strings feel very dry and a little stiff. although i did enjoy hitting with a full bed of gut, is there any reason i should cut out the strings or continue hitting with the strings?