The joint of my South West (3/8x11) has frozen on me ~5 times in the 20 years I've owned it. All but one time, I could break the fusion with the help of a friend. But one time, after about 2 weeks of failed attempts, I had to use a rubber strap oil filter wrench to separate them. Since then, every time I play with the cue for the first 5 minutes, I break the joint a crack and recinch it. It gives the shaft a chance to adjust to whatever temperature or humidity condition that was causing the problem. I haven't had the problem in the past 10 years or so. It's not enough of a problem to keep me from wanting another.
Greg
Greg