It is also possible that the breechblock is not recoiling far enough to catch the holdopen. This is usually cured by a change of ammunition.
If your holdopen spring is broken or missing and can't be immediately replaced, I recommend removing the holdopen completely. If it is left in place without the spring to keep it down, it will bounce in recoil and either be broken itself or chip out the notch on the bottom of the breechblock.
Jim
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