What happened?

This is an odd commercial. It's odd because it's correct. She correctly says,"  I wish we could lie here forever." But it's not the commercial that's running every night in Miami, at least. The same spot has the woman saying, incorrectly, "I wish we could lay here all night." Now for awhile VW changed it, and ran the correct version for a couple of weeks, then all of a sudden we're back to "lay". I wonder why. I'm sure there's a story behind this.