I have recently the problem that i miss some textures like roads, buildings. Sometimes i spawn in an almost blue map because nothing loads.....it is very anoying
I assume you have many mods installed. If so, they're too big and the game is not able to load that much data - better uninstall the ones you don't really need. If that's not the case, you should provide some more info about what you have installed and when this began to happen.