I have never had it happen on any Pinecone holes , but I have had it happen at random times just about anywhere else , mostly in a multi-player game and sometimes after a "load assets time-out error."
I never use speedy boost, Jim, yet it happens, albeit rarely. It confuses the crap outta you when it does happen..LOL
@ OP - just sit back and laugh it off. I doubt WGT engineers can even figure out why it happens. It may help, when you notice it, to right click the screen and send a bug report so they can see what's causing it. Like I said, it's a pretty rare occurrence.