Autocad civil 3D 2014 - Undo command maxing out and unable to continue problem.

[zootango]

Was using Civil 3D 2012 and had no problems at all with the Undo commad.

Purchased new computer with a clean hard drive and fresh operating system and loaded Civil 3D 2014.

Also loaded the service packs.

Now, when I'm drawing away in 2014 I'll get a popup box message stating that the Undo command has maxed out something or another and can not undo anymore.

This is a real problem,  It happens pretty often and at the worst times it seems.

I'll do a Layer-ISO and be working along then I'll do a Layer-UNISO and get the pop up Undo error so that I can not get back to my previous layer state unless I've saved a layer state before running the Layer-ISO command.

So the Undo maxing out problem not only effects the Undo command itself, but also the Layer-Iso command as well.

The only solution I've found to get the Undo command working again after the pop up Undo command maxed out message, is to quit out of my drawing and re-start a new Autocad session, open my drawing, and then I can work for awhile but ultimately the maxed out Undo command error will strike again at the worst possible time as always.

Anyone know the solution to this Autocad problem???