Fluid surface disappearing

I ran a big fluid sim yesterday, and at frame 57, for some reason, the top faces of the surface disappear. Very strange. Could this have something to do with memory? Or something else?

Here’s a screen cap of frame 56 and frame 57.

http://imgur.com/ZW5i7

Check to see few property settings to see if they are set right. For Fluid, Fluid / Volume Initialization should be “Volume.” For Domain check to see, Fluid / Time Start and End is set right in seconds. The time setting is not automatically adjusted just because you set your time line with Start and End time.