Trigger reset problem on my latest AK

[cfortune]

So a few weeks ago I got an Arsenal SAM7R. First thing I did was clean and grease it. I finally got around to shooting it on Saturday. The trigger seemed to almost pause when resetting. It felt strange to say the least. After a while it would actually stop at that point. A tap on the side of the receiver or a slight nudge on the back of the trigger would cause it to become operational again. This only happened twice. After I got home I cleaned the thing like crazy and oiled as much as the trigger as I could without removing it, no sticking but it still feels like it's being held up a bit in that same spot/there is some resistance there.

I've never experienced this with any of my previous AK's so I thought I'd ask the experts (doesn't say much, all my previous AK's have been Saiga conversions with G2 triggers). Something that may go away with use, should I get it polished, or should I look at buying an aftermarket trigger?