Maybe you violated some rules? Maybe you used coinbase to transfer crypto to gambling sites?
I do not know either I have violated any rules or not. For transferring fund to any gambling site can be a reason for temporary disable of my coinbase account?? I do not think they disable account for sending fund to gambling site. Are you sure that they disable account for transferring fund to any gambling site??
Base on the experience of some of their users, and based on their terms, it's a Yes.
https://www.coinbase.com/legal/user_agreementBy opening a Coinbase Account, you confirm that you will not use your Coinbase Account and/or any Coinbase Services to do any of the following:
[...]
5. Gambling: Lotteries; bidding fee auctions; sports forecasting or odds making; fantasy sports leagues with cash prizes; internet gaming; contests; sweepstakes; games of chance
Now, if you really use your CB account to deposit or transfer btc to any gambling website then I guess it might be the case.