Failure to complete withdrawals, no customer support response...etc..
Either their system is terrible and can't process withdrawals (or customer support pertaining to them)
or they're short on funds and are trying to cover it up..
Be careful leaving funds in the hands of these clowns...
When price moves up like it does now, most of the exchanges of course don't like when customers try to take advantage of that and leave the platform.
Therefore only hold smaller amounts at exchanges, otherwise...well now you know what happens.