Yeah... Gonna head over to Golf Galaxy and pick up a new shaft. Shaft is a few/several years old.
My 3 iron has been my main club I use when starting practice, drills, etc. Many years ago, i decided that if I was hitting my 3 iron well, then the other clubs would be good also. Prior to that, if I started practice, i would start with a higher lofted club, and by the time i got to the 3 iron, I might not be hitting it too well. So now i always start with 3 iron, then pw, then driver, then 4i, then 9i, 5i, 8i, 6i, 7i, 60, 56, 52, then random... But the 3 iron gets many, many more reps with speed drills than does 52* for instance. So i think i just weakened a spot over time or it was a bad spot that was strong enough for several years, but finally had had enough. Thanks for the comment.