I am also having the same issue and contacted QBO, they did not understand the issue.  Mine seems to be with AMEX only.  Please get this corrected.  The information is in the bank feed under transactions and my field "copy to memo" is checked off.  It is clearly there in Qbooks, but no longer transfers into the memo field.  This is extremely frustrating.  I just spent the last 3 hours manually entering memo items that should have already been in the system.