https://www.reddit.com/r/NavCoin/comments/7it58g/update_from_the_team_on_the_exchange_issue/?st=jb0nys8g&sh=061d4a18

"Hi everyone - here's the latest on the network:

We've been working closely with Bittrex over the last few days to resolve a network issue. As part of this, we asked Poloniex to also pause trading until it was sorted, just to be on the safe side.

The team are now testing a solution, and we will send out a full update in the next 24 hours with more information. We just want to thank Bittrex for their assistance during this time - and we do understand that this has caused some inconvenience for members of our community, so thank you all again for your patience! Talk tomorrow."