This is from Peter Todd on Twitter.
https://twitter.com/petertoddbtc/status/891662660454010881
The "congestion" explanation doesn't make any sense.
I'd recommend the precaution of taking you BTC out, as they may be covering up a hack.
Exactly. Better safe than sorry.
It is extremely likely that coinbase may be experiencing liquidity issues, and therefore cannot afford to bring new support staff in or even upgrade their system. Basically no progress has been made in the entire 3rd quarter in improving anything, which is extremely fishy.
Pull out when you still can. Coinbase may be legit now, but they may turn scam just like Cryptsy or Mt Gox which were once considered to be trustworthy. Get your funds into a wallet that you actually hold the private keys of.