My S mode has been operating curiously recently...

I find that, after my car is fully warmed up (5-10 minutes after starting to drive), my S mode starts behaving exactly like D mode. I switch between the two modes and nothing changes. During the first part of my drive the S mode works as expected - typically going to one gear lower and keeping the revs higher...

Has anyone else encountered something similar? I'm scratching my head on this one - I have done some vag-com adjustments but I don't think I touched anything related to this.