Random parts in my assemblies are becoming transparent

Hello All,

I have been having this problem for a few weeks now and it is driving me insane. I have searched to try and find anyone else with this problem and have had no luck. Large and small assemblies that I have been working on will randomly make parts transparent but transparency is not turned on for the parts, I have updated my driver to make sure it wasn't an issue caused by that and still no change. I hope someone can help with this issue and I thank you in advance.

SolidworksAssemblies