Google Pay - limited service

my user experience leaves me very frustrated 98% of the time. I'm considering going back to tapping a physical card. I consistently have to either verify a few times with thumb print, even when I've just used it , or the phone "moved too fast" even when it didn't or it literally does nothing at all, and I'm stood at the checkout, waiting & trying & nothing is happening at all... even when I come out of my wallet & refresh , it still does nothing... it's so intermittent. it's not good enough !!

A year later update: the carousel method to choose a card hasn't been improved at all. It's still much slower than previously to go through cards as you need to wait for the animation to complete each time. If you frequently use different cards (I travel a lot), then it's very frustrating. It used to be so much better with just a simple list of cards on the app. At least the reliability got better.

Generally Google Wallet works well for me. However, I can no longer access the details of my Amex! I can pay with it but I can't, say, change it to my default card, edit details or anything. I can access details of all other cards. I tried uninstalling and reinstalling the app, but to no avail. I reported the problem multiple times but I haven't received any solution.