The coins can go down if you hit the Undo arrow, even accidentally. Even if you had free undo's, there's no notification when you start paying, just a 150, 250, under the arrow. There's no way to back out of that, if you hit it, you 'undo' and pay. Just like the 'extra cards', if you hit it accidentally, too bad, you're out 650 coins. No confirmation, no undo.
The 'saving lives' is a glitch, don't know how you get EA or Pogo to correct it. The default limit is 5, you can win 'time' or games with the Spin and Rewards, and the Tasks.
Hope that helps?