My clutch is starting to feel a bit strange.

It's not slipping at all, but it feels lighter? Like I have to finesse it more than I used to. Like there is less positive lockup (horrible description, I know).

My commute went from 0 miles to 40 miles a day in gridlock, up and down some hills and ramps. Could this have something to do with it?

Anything obvious that I should check before sending it to the shop?

Thanks in advance!