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This happened to me sending an ETH tx last night. Exact symptoms OP described on my first attempt. I closed the app, reconnected my KK, waited a few minutes to make sure the transaction didn’t actually get sent, and tried again. On the second attempt it worked perfectly.
It was a small tx so I wasn’t too worried, but I probably would have freaked a bit if I had been moving large sums.
Just to be clear, it was after the second (final) tx confirmation message/button press. The device screen went back to saying „Keepkey“ while the Google app UI asked me to confirm on the device and was frozen there (cancel and back buttons in app didn’t respond).
No need for a response or anything, just wanted to provide some more info.