Hi, thanks for reply, currently it just shows the battery reading.
I think I may know what happened. Before the matched started I took a picture of the team and the camera selected ISO 500, at a shutter speed of 1000th on Auto1.
The next picture, of a jet flying over, which I took to check the autofocus, had the ISO of 12,800, as did all the subsequent pictures.
I think I may have gone back into the menu just to check the MAX ISO setting but forgot that I had to go into Auto1 first before choosing the MAX setting. If the match is delayed, the light can diminish pretty quickly.
I've tested the camera this morning and it's fine on Auto1, with it changing the ISO setting, rather than the aperture to changing shutter speeds
Having used my trusty Nikon D5600 for years, I simply got into a muddle on the new menu, and was careless.
I'm am going to read the user guide and give the camera a thorough shake down over the coming weeks.