I spent an hour on the phone with a rep yesterday, who said he hadn't heard of the issue before.  In this thread, all of the QB reps also say they've never heard of the issue before.  But they're hearing about it now, so it's clearly a problem for a lot of us. 

I was not able to resolve the issue yesterday, I just disconnected the feeds for now and will import manually until I can ensure with QBO or Chase that the issue is fixed.