Try incrementing the load more slowly (increase the number of substeps or decrease the time step size). 

You do that under Analysis Settings.  Show a screen snapshot of your analysis settings before and after you make a change.

Named Selections for the offending element can be created via the Identify Element Violations property on the Solution Information Object.

Do that and look at where the element that has become highly distorted is located. Reply with a screen snapshot.

 You may need to improve your mesh to obtain elements with better aspect ratios.

You do that by simplifying the geometry, especially near the highly distorted elements. You may get better element shapes by slicing the solid into pieces and reassembling the pieces using the Share button in SpaceClaim.