I got banned once due to a mixup, and it took a good 2 weeks to get re-instated. Other than that Coinbase has been good for me, and it better stay that way cause I depend on it.

Would be shocking if they banned you for life just cause a small amount of BTC you purchased increased in price, it must be another reason.

I wish Coinbase had phone support, no excuse not to considering how big they are.