How do I stop Bank Of America from automatically transferring $25 from my checking to savings via online?

You can cancel the transfers online. Sing in your account, go to the transfer link. Get the transfer activity there and cancel what you need. You can always call the customer office support to find out in details how to stop automatic transfer Bank of America. You’ve probably signed up for this service without realizing. Don’t worry, just fix it online, and there won’t be any automatic transfers anymore