Yes, I have the same. It's okay in spaceship mode because of the extra tabs to keep it aligned, but surfboard mode is very loose. I should try and get some varnish onto it some day to see if it can be tighter.
I exchanged Shockwave today and managed to get the last one in the store. Unfortunately, the connector on the left engine pod is still loose. And the elbows are loose too. Oh well, it's only a toy that retails for $89.99.