I've been using QB online for about 5 years. ALL of this time the SAVE & NEW/SAVE & CLOSE button would default to whichever you used the LAST time.  I prefer SAVE & NEW when entering payments, for example, so unless I accidentally chose "Save & Close" it always stayed on SAVE & NEW. 

LAST month, when I received payments this worked as it always has.  TODAY, I am having to reselect SAVE & NEW manually each time from the drop-down because it keeps defaulting back to SAVE & CLOSE.  

My only theory is that they MUST have released some new functionality.  EVERY time they update something QB breaks something else.  SOOO Frustrating!!