Not seen this before.
Had just come out of a game, and my PW was damaged. But the button to heal him didn’t work (although it did darken to show it knew I had pressed it). Similarly, I couldn’t see my deck, tap on my PW, or look at the node rules. I could exit the screen back to the node, though.
When I tried to tap on ‘FIGHT’, then entire screen locked up and I had to reset the app.