id say its binding on something up front and you should see the wear. Similar just found on a brand new smith revolver. Look at the area of hammer with flashlight and it was obvious where the issue was and needs relieving.
You could try different bolt I suppose but I"m not familiar at all with AK stuff
I'd surmise could be a weak recoil/return spring too assuming it works manually all the time.
Oil is never a bad thing either. Lube makes supposed issues go away quite often.
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
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