Why can't I unstake my Ethereum on Binance?

Could you please explain why I'm unable to unstake my Ethereum on Binance? I've been trying for quite some time now, but it seems like the system is not responding. Is there a specific requirement or condition that I need to meet before I can unstake my tokens? Additionally, could you clarify if there's a fee associated with the unstaking process? I'm also curious to know if there's a time limit for unstaking, or if I can do it anytime I want? Finally, if there's any technical issue or maintenance going on with Binance that might be preventing me from unstaking, could you please provide an update on that? Thank you for your assistance.