One of the best Bitcoin wallet closing member's account without any specifics reasones. They just mailed about violates their terms and condition. They are deleting account permanently. Coinbase give me chance to move my fund on other external wallet.
If you are using coinbase you should be move your fund as soon as possible. Because account delete is not normal case. I think coinbase was hacked anyhow. That's why may be coinbase required to make new account and closing old account.
For safety reasones I feel better to move your fund to any other wallet before they locked account.
I receive below mail from coinbase before deleted account:
Hello,
Thank you for your interest in Coinbase. Our primary goal is to make digital currency safe and secure for our customers. Coinbase is a regulated Money Services Business under FinCEN (FinCEN.gov), and as part of achieving this goal, we are legally obligated to implement regulatory compliance mechanisms.
Upon careful review, we believe your account has engaged in prohibited use in violation of our Terms of Service and we regret to inform you that we can no longer provide you with access to our service. We respectfully request that you follow the on-screen instructions presented when you log into your Coinbase account to send any remaining balance offsite to an external address.
Should you have any questions or need assistance, please let us know and we'll be happy to help.
Respectfully,
Coinbase Customer Support
Edit: Coinbase not giving chance to appeal.