TINs not displaying properly

[SamLevy]

I have been having continued problems with ArcScene displaying my TINs with jagged holes running through them.  It only happens when you zoom in on them, and at certain angles the lines appear/disappear.  Not sure where the problem lies exactly, although it seems to just be a display issue.  Thanks in advance.

[SamLevy]

It turns out that the problem is not just a display one.  The holes actually have no value, which doesn't make any sense.  I created the tins from lidar and a clipping boundary, there is no reason for them to have these blank areas in them.