Texture load errors when changing levels

Whenever I change to a different level in my packaged game I am getting a lot of random visual errors that happen. For instance trees will lose their entire texture, while others will stay normal and others will lose their opacity and get greybox where it used to be transparent. The landscape will have some areas turn completely white, while others flash in and out, and depending on the build sometimes horizontal lines cover everything. Does anyone know what could be causing these errors?