Did it freeze or lock up? Ie. was the game still running with the animations still playing but you just couldn't do anything? There is some case where player is holding a card (I think) and it somehow disappears ending up in a stuck state. I haven't been able to reproduce it though. If you remember any more details how you ended up like that, they'd be welcome.
I think it's the "freely revisit" gems that cause the game to hang - like allowing it to revisit squares gives it too many possible paths. If I let it sit, it would eventually finish calculating and execute the move, sometimes 10 minutes later(!) This is on a 2016 laptop though, YMMV!
I tried playing without accepting any of those gems, and it worked perfectly. I got into the trillions without a single freeze.
Thanks for a fun, weird, chaotic game :D