I used to shoot concerts back in the day. Mostly small ones but a few alternative festivals too. It was amazing.

First, I’d suggest just pick an iso manually. Inspect the setting and just choose it yourself. Light changes a lot during a show and that may confuse the camera metering.

Observe what’s happening, where the lights are. Don’t just shoot whatever to get the most photos. Zero in on the subjects, find that emotion, that connection between the artist, the music and the audience. Always with your finger on the button, even when you’ve lowered the camera, ready to click. Be like a hawk, looking for That Moment.

Not sure which concerts you shoot, if you’re already doing the ones with 3 song rule. But, my experience is the beginning of the show may be a bit meh - artists and audience is warming up. The best moments actually come later during the gig… So if you can hang out the whole gig, do that but also be patient, constantly on the lookout of the magic to appear. It’s always there.