I noticed another thread with the same problem, but I thought it necessary to describe it here.
Partway through loading campaign or battle, these multicolored lines saturate the loading screen (which continues onto the campaign UI and battle icons). This seems to only occur on particularly lengthy loading screens, and fixes if I change a graphic setting of any kind and reload. Still, it's annoying and time consuming to reload, and I'd like to know if anyone knows a fix for this.
I'm using a GeForce GTX 1050 Ti with the newest driver (can post specs or dxdiag if necessary).
Here's a photo of the loading screen with this glitch (and it continues onto the UI in campaign and battle):