Same happened to me years ago with my Panasonic Leica 12-60mm. The GH5 was in my bag along with lots of other things. Not sure if the bag went on the ground very hard or hit something in the bag very hard. Took the camera out of the bag and saw the lens ripped off the camera. Luckily I had the 14-140 lens I could use for the videos I was doing that day. I sent it to Panasonic and they gave me a replacement for free. Never had problems with the new one ever since.

@EspenB i can't but appreciate your zeal for the gh series. I do have a gh5 wich i pre-ordered next day when was available and after broken the second 12-60 "Leica" (very poor quality around the mount) i now use it mostly for photos with a slr magic 25 mm t0.95.

GH5M2 basically listed as discontinued.