they are doing the Mt. Gox style. for months now. Their engine is just bad.
They are making so much money, but instead of hiring some professionals to build a new engine they the exchange has to hold trading several times now. They still haven't fixed their freaking button bug. Somebody clicking twice on the sell button probably created the recent crash of their engine.
Lending system also shows several issues for months. Everything is super laggy at high volatility times. It's just awful.
I would highly suggest everybody to leave them. This should not be tolerated for such a long time.
Don't wait until they go over to the "We are hacked" exit plan.
There are several alternatives without so many problems.