Trees missing leaves

Hello, I recently had this issue where I was building my route and all of s sudden, the trees leaves disappeared leaving nothing but the leaves. The shadows are still cast as if there was leaves. Also when I zoom out a bit, the leaves start showing again but when i zoom in decently close, they vanish leaving just the trunk and making it look hideous. I have this issue on all my trees on very route I have and I am mostly using speedtrees but some other trees are also affected. Can anybody please help me fix this issues?
Do you have Antialiasing set to None? Cause that's an issue I've had before. If so then just set it to 2x and you'll be fine.
 
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