Jerry there was movement or potential for it somewhere in the head inletting ,giving the receiver the opportunity to come back under recoil ,you'll see sometimes in old wood that the top tang screw can turn past its original timing ,that's a sign ,too much finish around the edges can give a false indication that everything it tight and even start a crack during reassembly before you even see it ,those are just a couple thoughts ...it's always an idea to glass the head ,on a hard used gun it can give a nice tight fit where you cant see.
get some thinned epoxy into those cracks ,glass the head and touch up your finish .
Good luck!
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