I am annoyed with Bittrex at the moment... I sent a non trivial amount of Bitcoin there and it never reached its destination. They have been sitting on my ticket for about a month and the situation remains unresolved. I get weekly emails telling me that they are overwhelmed. I have yet to write back "You guys have a very serious cash flow. Hire more people to deal with your problems. You are sitting on a large pile of cash and a large pile of problems. Move resources around to handle your problems otherwise they will get bigger."
I am still trying to decide what to do next or what to do if they refuse to refund me my lost bitcoin.
This is probably due to a too low transaction fee...but of course I do not know!
Yeah we also had this problem with low transaction fees. Our transaction has been marked as an orphan due to outstanding confirmations on the bitcoin blockchain. But its really annoying if one uses other services and can't adjust the fee oneself.