I said I'd update when my P380 came back from Kahr, but I can't find the old thread now. Anyway I sent it in for light strikes that started recently after thousands of rounds through the gun by me and the guy I bought it from. I was thinking it was striker spring or striker pin, but my laziness in not trying to disassemble the slide myself and replace those parts paid off because that wasn't it. Kahr inspected and REPLACED THE BARREL. I don't get how the barrel could be the culprit, but the gun dealer who shipped it for me said maybe the cartridge sometimes seated a little too deep into the chamber, which makes sense I guess. Certainly the problem is gone, it was flawless at the range today.
Anyway I gotta give kudos to CS. I didn't try to get them to pay shipping to the factory because its so far out of warranty and I got the P380 used. However they've charged me a total of zero all three times I've needed service 2x on the gun and one on a mag, and this time they replaced the barrel, which is expensive in the P series. Free.