As the owner of four Kahr guns, including the PM9, I can merely sympathize.
(I've posted about this several times on TFL, but not on THR.)
I've had problems of one sort or another with all of them, some minor, some major.
Kahr IS NOT ACCOMODATING when it comes to genuine repair or replacement.
They'll perform an unsatisfactory pseudo-repair or give you a "new replacement" which will actually be a refurbished customer-return, and it will take 2-4 months each time, and you'll likely find the result less than satisfactory, but you won't get a refund from Kahr. I've done this through four cycles of returns with a single example, and it has pretty much soured me on the company and its management.
They might give you credit toward another gun if you fuss long and loud.
Some of their guns work just fine, of course.
If you have one, consider that you've had good luck.
Trouble is, Kahr's quality has been deteriorating, and their products are anything but consistent.
And this is what they advertise as "state of the art" quality control and manufacture (on their website).
Too bad, since a truly small and lightweight quality-made 9mm is obviously a good thing, if only such existed.
I'll be interested to see the Rohrbaugh, but no more Kahrs for me!.