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Wallowing,
My thoughts,
Magazine spring, its job is to push the rounds up to the magazine feed "lips". A weak spring or a restriction in movement of the follower will cause the round to set lower. When the slide goes to strip a round from the magazine, nothing will happen.
To strip a round from a "working" magazine, the slide must move sufficiently far enough back to clear the base of the case, as it begins its forward travel it will strip the round from the magazine.
If it is not chambering a round?
Does it strip a round from the magazine? Does it do it manually?
If yes, then you need to determine why the slide is not going to battery. (see post above)
If it is not stripping a round. Then you need to determine why it is not traveling to rear far enough. When you pull the slide rear wards do you feel, uneveness, excessive drag, or someother type of restriction?
A recoil spring that is either too stiff or too stiff for the ammuntion being used (very light loads?) will limit the rear ward travel of the slide. Too light of a recoil spring will cause excessive "hammering" of the slide against the frame.
As was mentioned above, a good inspection for broken, damaged or worn parts should be done. If you have some dummy rounds, it makes it much safer to to check the action of the pistol, by manually cycling it.
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