Supsites not loading - keeps reloading in circles

Hi There,

I'm having issues with the domain mapping (I think its the plugin) on my multisite. It makes all my subsites stuck in a loading loop.

When using Mozilla to open any subsites (with mapped domains) it keeps loading indefinitely. Subsites without domain mapping loads normal (slow, but normal).

The main website (cu2.co.nz) laods normal as well.

Any advice?