I've been trading on Coinbase about 4 years. I sent a Litecoin back in April as a test before sending the rest, and it's still pending on the Coinbase end after 4 months. After several support tickets, and trying to call I gave up on them entirely. It shows up with over 60 thousand confirmations, and they just completely ignore me. I'm not the only one that's had this happen in recent months. They have quickly turned into the worst exchange available. I'd heavily advise against trading with them. If you have an account with them, move it somewhere else, or offline.
That is why everybody should really stop using these online wallets! It is not worth it. Back then, the only reason I use coinbase was because they don't change miner's fees for the transactions. But when they were already charging it, I gave up on them. It is not worth it to risk my money then they have a sucky service. I had a problem one time, that my deposits were not credited but it had already 200 confirmations. I had to send an email before it got credited. They blamed it on the system downtime.