Re: deck count issues, reproducing the issue has been a stumbling block. Why that's so, I can't say, especially as it's been reported quite a bit. I think the issue is probably responsible for cards not being drawn on plays like Market and the shuffling sound continuing when the deck is apparently empty. Credit to, I think, Jonah42 for connecting the dots about the card draw issue.
If you want to lend a hand, what would help the developers out are reports that included the end of game logs, any observations about when it happens (only in campaign, only vs AI, only vs human, all of the above), observations like what turn it might have started.
Feel free to post here, but using the contact support button in game sends an email to our CRM software that I can then forward to the developers and easily track replies with.
Sorry for the ongoing issue. I've let them know that it's one of the more vexing problems in regards to player sentiment.