Finger issues

Hi All..  Been playing guitar for many years.. as of late, I've been having problems with really sore fingers after playing a gig.  I have callouses and all so it isn't that.  I'm just not sure why this has become an issue now.  I've had my guitar set up, the action seems to be okay..  just seems when I play a gig..  soreness.  It goes away after a day but its a drag when I have a couple of gigs in a row.  Just wondering if others have had this situation..  BTW - my primary guitar is a Martin HD28.. I'm using Elixer lights..   Thanks.  Deb