Chunks will go in and out of render, even though player is on them, or near them.
Log onto minecraft, open a survival world (without optifine!)
Walk around. Chunks will flicker in and out of existence
Chunks should stay rendered when the player is able to see the chunk.
We are unable to diagnose your issue due to the lack of proper debug information. Please review the guidelines before reporting issues.
In case of a game crash, please also attach the crash log from
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
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