I spent at least an hour chatting with QB support last week after I disconnected Bank Feeds from my account to try and fix this problem, and couldn't get it reconnected due to errors. She kept telling me that the only solution was to manually download QBO files from the Chase website and import the transactions to QB. She even referred to the article from QB support that explains how to set up Express Web Connect when she told me this. She also wouldn't connect me with a higher level support person who actually knew what they were talking about. I eventually gave up, left the chat, and got it connected myself. Time will tell if that fixed the missing transactions problem.