Had this one to the local 'smith last June, 2020. The gun had locked up, as in I could not pull the trigger. Would not budge. After the 'smith fixed it up, within a week I shot 50 rds. with no issues.
I had not shot this one since, so I took it to the range today. 22 rds. later it locked up again. I think that it may be "shot out".

The gun has not been abused. I am the original owner, I maintain it the best I can, but this piece has over 5,000 (yeah, five thousand) rds of full house .357 mag loads. 15.5 grs of H-110 over a 158 gr bullet.

Take it back to the 'smith? Send it S&W and have them look at it? Use it for a paperweight? This is the only 640 (of any "dash" model) that I know of with this many rds.

Thoughts?