If you look at the individual parts that make up the WEI score, which is it that scores 4.4 (i.e. the lowest score)?
IF its the GPU score, then it could be that the system "updated" the GPU driver and its not as good as the one you already had. If so, check to see if a GPU driver was "updated" in the last Windows Update, and if it was, try rolling it back.
Either way, it would probably help to know what all the individual scores are, and what updates were actually installed.
WEI - https://www.sevenforums.com/tutorials/263-windows-experience-index-update-refresh-score.html
Driver rollback - https://technet.microsoft.com/en-us/library/cc732648(v=ws.11).aspx