Weird flicker/reflection on some surfaces

Hi guys! I’m new to Sketchup but I managed to build my first model. All of the surfaces look normal except for two opposing walls that have a weird flicker. It does not seem to be the material as it stays the same when I change materials. I need to export it to another program and when I do, only those two walls displays wrong again.

Anybody can help?

It looks like “Z Fighting”. There are probably two faces occupying the same space.

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Thanks ! Problem solved

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