I see no reason why they should stop withdrawal without any form of notice if it is as a result of technical issue, but wait, what are you still doing with exchange like Hitbtc when we have other reliable exchanges. You dont have to invest in any coin you dont find on reliable ones like Binance, bittrex and other top exchanges.
HitBTc is one hell of an exchange that registers scam projects a lot and most of the projects on it end up turning shitcoin. You must have got yourself involved too in some of these shitcoin that made you to consider that exchange for use.