Colour glitch on operation firestorm/constant crashes on dawn breaker

I recently downloaded the second assault DLC and when ever i join an operation firestorm server the colours on the map glitch out allot (i have photos to prove it) and it makes the game unplayable as it covers the scope in random colours. This only ever happens on firestorm though. And whenever i load into the dawn-breaker map it crashes either mid game or as im in the loading screen or as i deploy