Render Texture Artifacting

I’m having weird black artifacts appear on my render textures when they are transformed while the game is running.

I am using a ScrollRect as a scrolling container for buttons (the buttons are just textured quads with the same render texture applied to them). When I translate the quads while the game is running, strange black artifacts will appear on the quads themselves.

Is there a way to fix this?

Edit: Interesting to note, setting every quad inactive except for one fixed the artifacting on the only visible quad: http://i.imgur.com/OInBBWs.png

The intensity of the artifacting seems to be related to the number of objects on-screen that use the same render texture. 5 quads active with the same render texture has a really pronounced artifacting, 3 is more subtle, 1 is visibly non-existent.

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Is it Z fight? If you check the RenderTexture are the artifacts in it?