You now have came to the right point. You are not only one who faced delay in your payment update but there are many users who had similar issie on coinbase. I have earlier predicted , i still recommend you to choose another wallet.
Coinbase will asks you 0.00059 btc as fees for the every transaction and I noticed two days before, they bannered the text as the transaction may be delay due to lack mining and network for a transaction. I think this could be a reason for this delay but I use coinbase from the day I started into the forum. Much faster than blockchain and another wallet.
Actually it was on around 100k satoshis the last time I did some transactions there. Everything went smooth just like my usual transaction even the network is congested but with the current bitcoin price, 100k satoshis a good amount to considered by an average bitcoiner so the fees provided is somehow not that cheap.
I suggest to OP to flood Coinbase support as only them can answered you clearly.
The important thing though is that there are user friendly solutions providing similar functions to Coinbase while offering real security and freedom from banks and governments, like a TREZOR.
People choose Coinbase because it's the first option, but the more times exchanges and pseudo-wallets screw up the more people will start moving to real systems for their funds.
