mg wrote:
There are 6 or 8 spiral nails on our deck that will not stay down. The
boards are flat on the deck and do not appear to be cupped or warped.
But, within about 3 months of driving the nails down, they are back
up.

Should I pull the nails and replace them with the next size larger
spiral nail?

If you go this route, you might try ring shank nails, or hot-dipped
galvanized.

Should I pull the nails and replace them with coated deck screws?

Worth a try.

Chris