Hi Janice,
Welcome to the Autodesk Forums.
I remember seeing that problem a year or two ago. I think updates fixed it. Be sure to get all 3: Civil 3D, Map 3D, and AutoCAD updates.
Dave
Dave Stoll
Las Vegas, Nevada
64GB DDR4 2400MHz ECC SoDIMM / 1TB SSD
NVIDIA Quadro P5000 16GB
Windows 10 Pro 64 / Civil 3D 2024