Real time shadows are suddenly low resolution with lots of errors.

I'm thinking this is a bug, but I'm not sure what's causing it. My shadows went really bad all of a sudden. Banding, low resolution, all sorts of things that were never a problem before. I'm not sure what happened.

Settings:

Pixel Light Count - 4 Texture Quality - Full Res Anisotropic Textures - Forced On Anti Aliasing - 2x Multi Sampling Shadows - Hard and Soft Shadows Shadow Resolution - High Resolution Shadow Projection - Stable Fit Shadow Distance - 200 Shadow Near Plane Offset - 2 Shadow Cascades - Four Cascades

I've tried changing all those settings and everything else I can think of. The problem just started out of the blue, so I'm not sure what's happening.