Wallet maintenance implies one of several possible things could be happening:
- There could be a possible fork on the block chain. In order to protect funds, we have disabled the wallet until a consensus has been made on which chain is the proper chain.
- The wallet has been updated by the developer and the exchange is in the process of implementing the wallet update.
- The wallet daemon on our server has hung or crashed.
There are other scenarios that cause a wallet to be disabled. In general, the wallet is disabled to prevent users attempting to deposit or withdraw to a wallet that may not be functioning properly. We are always actively working to bring wallets in maintenance back online as quickly as possible.
Please check https://www.bittrex.com/status for the status of a wallet. Once the wallet is back online, if you are still having any issues please submit a ticket.