I am  having the same issue across all clients.  I have a client with Amex platinum, Amex Black, Amex regular business gold.  This is incredibly frustrating and continuing to download transactions from Amex and manually upload into QBO is ridiculous especially with all the increased costs of having QBO.  When will this be solved?  It has been intermittent since the beginning of the year.  No activity at all for the last 2 weeks - I've been manually updating.