Bluesound recent update 4.0 tanked sound quality ???

BluOS but more importantly Bluesound just rolled out their v 4.0 software/firmware update.   After the update I'm hearing something totally different than I was getting before the change.  The overall sound is much fatter and the bass is soft, flabby and lacking detail.  I have four different Nodes (Node 2i) in the house and some of them are driving some really decent gear in a two channel room so the change in sound is very noticeable.   Has anyone else noticed this change in SQ following the firmware update?  I respect the opinions here and would appreciate your thoughts.  Thx, R