They refer to the problem in the network
not a problem with zcash. poloniex is a bad exchange. shouldn’t trust them with your money, imo.
They reder to a problem on their wallet/network not zcash’s network…
Poloniex is famous for blocking their wallets for undefined period of time
That is their default maintenance message. It’s extremely misleading. The ZEC team was in touch with them the last time this happened and they ended up not responding.