Having the same problem with my Lumix GH5S. Unfortunately Panasonic has told me it will cost $250 to replace the slot (stuck in slot 2). I use the camera primarily for films so having 2 slots is one of the reasons I bought the camera. After taking it to the service center ( I live in Korea ), they had it for one week . I was told that the card is so jammed into the corner of the slot that the only option is to replace the part, which will unfortunately take up to a month to arrive in Seoul. However, if I'm able to fix it then I they'll just use the part for someone else. After getting the camera back and magnifying the inside with my phone camera, I can definitely see the chunk in the corner, and it looks literally packed in. The best part of the story is that it appears to be my friends SD card. Happy smiles all around.