Gobos in a ColorSource Spot melting the diffuser.

Hello!

We just struck the first show where we used our ColorSource Spot Vs.  We had used patterns in several of them, inserted into the gobo holder with the diffuser - and half a dozen of the diffusers melted to varying degrees.  I read the manual and couldn't find anything, but is there a specific order they need to be in?  Or a special precaution we need to take?

Thank you,

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