Did you tighten the grip frame? Very common for the screws to loosen up especially the rear one.
If the sear is the culprit then check it for damage and with well used sears they have been known to round out where they are supposed to catch. If that happens you need to find a new one.
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I'm all out of ideas again and this text is so plain.
I'm still not sure how I feel about this new look.