Re: Coinbase just told me I'm not eligible to purchase BTC. Because the price is up?
Had several cash deposits and withdrawals in the thousands combined with activity from "coinbase.com." I found the magic recipe for getting your bank account closed 
You were buying btc, so why did you have cash depots AND withdraw at the same time? Large cash amounts like this trigger money laundering to the banks. If they cannot follow you money other than coinbase transaction, they'll just close your account just to be on the safe side.