Four weeks ago my 2018 fender professional strat’s 1st E and B strings after playing for about 1/2 hour sporadicly started stiffening up and twangs in the open position and the longer I play the more difficult it is to bend the strings. The strings stay in tune. My luthier who builds guitars and works on guitars for Quinn Sullivan, Emerson Lake and Palmer, and others checked out the start from head toe and said all parts are perfectly setup and functioning. We changed out the strings made by different companies a few times but the problem persists. The luthier thinks it may be a humidity problem. My music room is currently at 40 percent humidity. I have 14 guitars and none of them ever had this problem. Has any experienced this issue.