I have a SxS with a problem. The fillet in from of the lug is detaching slightly and I suspect the lug has moved slightly since the ejectors are not working properly. Gun too old for warranty repairs.

Questions-
1-What causes this? [It has happened on three other guns in the last 20 years.]
2-Can it be avoided?
3-Who might be a good choice for repairs?

Thanks in advance for your suggestions.

PULL!
Hal M. Hare