05 poping out of third

I bought my mazda 3 new in 05 its got 48,900 miles on it and when I'm driving around town just kind of lazing shifting it pops out of gear, it didn't use to do this, also the clutch has a small, tiny vibration in it, something you wouldn't notice unless you drove the car new, could it start to be slipping? I think the cables on the shifter are messed up its still under warrenty I might take it down to get it checked out.:1zhelp:

If its under warranty, I would get a appt. set up asap.
Also I would post this under www.mazda3forums.com , alot more members there to help you out mazdarider!
-peace