For the last several months, I have found that bananas in my grocery stores (two food co-ops that I shop at) have a brownish skin rather than being yellow (and getting spotted as they ripen). These brown bananas just go more and more brown. And they taste different too. I'm not talking about the browning/blacking that happens beginning with spots. This is an even browning of the entire skin. Any idea what is going on? Are these stores doing something wrong with respect to the ripening process? Thanks.