When closing out an issue as resolved I think it’s nice to add a little message to the customer to say you’ve done so and tell you if they have any other problems etc. However if they respond with a nice Thankyou it seems to automatically reopen the issue and send the “Uh oh you have problem” notification. It would be nice if messages added to closed issues would still be passed to seller or customer but there was a “This issue is marked as resolved, would you like to reopen it?” choice when you send the message… or maybe there already is and someone just misunderstood 
Good point. We’re going to be rethinking that section in the near future as we roll out private messaging.
The other issue with issues is customers reporting a case issue to Tindie instead of the seller. We’re trying to quiet those down with the private messages. We’ll see how private messaging changes things, and then adapt issues around that behavior.