Yeah, I had that issue, too, with my d-pad. I had trouble finding the silicon lube, too, at least at Lowe's and Wal-Mart. I finally went to Radio Shack, and while there was no hope for finding a nice small tube of anything, I did find a can of "Radio Shack Technology PLUS Control/Contact Cleaner & Lubricant." It works nicely. Just don't try to apply it directly to your Zero with the little red straw they provided. WAY too much pressure. I sprayed it on a paper towel, then rolled a toothpick in it and applied it to the d-pad and buttons. It worked.
