VO2 unexpected conduction $\ce{VO2}$ is a weird metal which becomes a conductor at temperatures higher than $\pu{67 ^\circ C}$, but below $\pu{67 ^\circ C}$, it is an insulator!

How is this possible anyway? This is against solid state theory and how are we supposed to create band gaps with it?
It's not really the same vanadium dioxide.  The 67°C temperature corresponds to a phase change.  Compare with the phase change in solid tin.