From what you described it's likely the camming surfaces on the barrel extension and locking bolt need to be looked at by a competent ‘smith. If you try doing it yourself the fix can be elusive and you may make it worse; Elmer Keith wrote about having the same problem with his NID Magnum and it took several gunsmiths to finally fix it. I suppose it could be a weak lever spring but I think that probability is low ..... but that's easy to confirm/deny. Sorry I don't know of a source for a NOS lever spring.
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