GFX100s BUgged out

Hello, I was recently out for photos in the morning and after setting up my shot and taking a couple photos the camera was saying it couldn't write to card 2 (both cards are set to mirror) but it was still writing to card 1. When I tried to power cycle the camera, I hit the power button and the screen stayed on live view and continued to work, it wasn't just a freeze frame, so I just took the whole battery out and it seemed to fix it but it was still very odd.

I went to the newest firmware maybe 2 weeks ago but I've shot with it since doing that and had no issues. Has anyone else had this problem and did it come back much? Thanks!