This was actually a major factor for me when deciding not to trade with Coinbase, since it is impossible to tell if a deposit will get lost or a withdrawal will get stuck. I need to know these things individually to be able to trade with Coinbase.
At the very minimum, I need to have a guarantee that online means
(deposits openANDwithdrawals openANDtrading enabled)
(deposits openORwithdrawals openORtrading enabled)