Allan, as a first step run cleaner through the action, take out the ejector mechanism in the forend and clean it, and make sure the rod is sliding smoothly through the barrel lug. Most problems are caused by crud and dried oil. I think the problem is crud in the forend mechanism, although it may be excessive wear. When you look at the sears you will be able to tell.
If the symptom persists you may at least be able to identify where it is. Taking the action off the stock is not too difficult if you need to go to that step.
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