Hey, I found this strange issue on Ubuntu Mate 18.04. When I safely remove a device in Caja panels seems to crash and restart. This doesn't happen when I remove the device from desktop icon.
I was also able to reproduce the same issue on my laptop and i think it's a bug.
I've been hitting the same bug since updating my HTPC to 18.04.
16.04 didn't suffer from this bug, though that's probably still a manageable window to bisect if the problem is actually in caja itself rather than GTK3 for once!