I second that, with 500 miles on the clock and being brand new something is VERY VERY wrong....

That shouldn't happen to any bike at any point in its life EVER.

Take it back to the dealer, park it in the shop, give him the keys and ask for the manager.

When the manager arrives hand him the tube of GUNK and ask him if he has any YTS scheme people on at the moment and walk out.

I would suspect that you either have some pipes mixed up somehow (very unlikely) or someone has put something somewhere they shouldn't have done....

Curious...