Shakes when Nikon 24-70 is used with D800

Hello,

I never had this before but I have it now on several of my photos.  When I enlarge my photos that been taken with Nikon D800 and 24-70 I notice that there was some minor vibration when I took the picture.

I wonder if there is any way beside using the tripod.  As you know it is not practical to use tripod 100% of the time.

Thanks.

Mo