Hi. I don't think I've ever had a problem with shopping cart checkout before, for many purchases over 2 years, but repeatedly tonight, I'm currently getting the following error on the final last step, when paying with same Discover card I've used repeatedly in recent weeks (balance OK).

I started over from fresh cart link 3 times, and completed the 4 steps quite quickly in less than a minute each time.
Still fails...

Form Validation Error:

Your Session has Expired. Please Return to Your Shopping Cart and Proceed to Checkout.

Should I just wait and try again tomorrow or what?
I think some of my cart items will go off sale tonight,
and so will have to be deleted from purchase tomorrow.

Thanks