That sucks! :(
I took my funds off of Bittrex entirely a little over a month ago, when reports started surfacing of accounts being frozen. I didn't want to run that risk and feel more secure with my funds in my private wallet anyway.
If you are looking for an alternative, I hear good things about Binance lately. It has much cheaper fees than Bittrex and lists a lot of popular coins. It is Hong Kong based. Even if you do move to another exchange I would still recommend keeping your funds in your private wallet at all times...
alternatively... I have started trading on Etherdelta too. You trade decentrally, so they can't lock your funds even if they wanted.
I have moved to Binance, I will get this message out there and hope they lose loads of business
They definitely has lost quite a big chunk!
Sov.