I have had issues with it as well and have to switch off the NFC and switch it back on to get it working ok. It is a samsung phone that I have as well.
I flew from Manchester for the the 1st time and had a few issues going through security with my libre sensor on and I'm a bit worried about flying home with it. Has anyone had any issues coming home as obviously the language barrier will be one when you try to explain what it is. I'm flying...