Having the same issue.  Transactions were downloading fine through February 2019.  The last 2 weeks download screen is empty.  As a previous Intuit support member stated using web connect manual download could cause duplicates when (if) the sync starts working again.  This particular client uses Amex frequently.  If I wait too long to download there will be hundreds of transactions and I won't be able to reconcile in QBO.  If I manually enter it will take forever - time I do not have at this point.  I suggest Intuit escalate the support ticket and get this fixed.