I had the same CM9 experience today
I bought my CM9 at a local gun show last weekend and after a cleaning set off to the range to this weekend for the recommended 200rd break in with 200 rds of WWB. I had a few issues in the first 100 rds with the slide locking back after the first couple of shots. This occurred each time because the nose of the bullet had turned down and was basically hung up at the base of the feed ramp. I would have to pull the slide rearward and push the mag release to unlock the slide. At about 120 rounds I looked down after finishing a mag and the tip of the guide rod/recoil spring assembly (visible on the front of the gun just below the barrel) was gone. Luckily I was able to find it and thread it back onto the tip. It never stayed tight from that point on and I would have to tighten it ever six shots or so.
Still insistent that I was going to get through the 200 rounds today while I had the time, I pushed on. At about rd 180 the whole recoil assembly failed. It was protruding out the nose of the gun I could not even get the gun disassembled to examine the gun more closely. I took it out to the range gunsmith who did disassemble the gun and reassembled but could not make any specific diagnosis other than, "If I were you I would send it back to Kahr." Needless to say, I feel more than disappointed. I have owned several different 9mm from low end Rugers to Springfield XDs. I have not ever experienced anything like the mechanical failures that I was dealing with today. I am planning on sending it back to Kahr for service and hoping this will be worth the time and effort that it looks as if I will be investing in getting it functioning properly.
As a side note my dad was breaking in a CW9. It also had to be taken out to the range gunsmith when the guide rod was hanging out the front of the gun as well. The gunsmith told him the recoil spring was in backwards and flipped it (incidentally it had never been disassembled by my father, so it would have come from the factory that way???). The gun worked flawlessly from that point forward. I shot both the CW9 and CM9. When functioning they were very accurate at self defense distances and beyond. My ability to shoot accurately with this gun and its totally concealable size keep me hoping it will work out... time will tell.