Vanishing Sky...Texture Issue?

Hey everyone! I hope this is the best place for me to post about some persistent issues I have with my game. Whether I'm playing in story mode, online, or in LSPDFR, occasionally the sky will vanish and turn pitch black. Sometimes it even doubles the texture on the ground, as you can see below. The only things that will remain on the horizon, if you will, are skyscrapers, trees, mountains, etc. It's gotten so annoying to the point where it gives me a headache to have to stare at a half black screen. Sometimes the sky displays perfectly fine, which is why I'm stumped right now. My computer does have the necessary system requirements, but gameplay does lag a little so I downgraded some of my settings to make it run smoother, if that has any impact on what's going on. Are there any suggestions some of you might have to either improve texture quality/decrease pixel size as well as keep the sky present? Thanks!

Screenshots:

Edited November 6, 20169 yr by MPatullo