Don't worry about it if it went away. I never got another card. This is a problem with VZW. When I was getting it they were having a lot of network issues. I finally put my phone to 3G until it blew over. Maybe they're having isolated problems again.
This happened to me a few times. Verizon Customer service rep told me there was a malfunction of the 4G network. 3G worked instead so i continued using my phone. I didn't concern myself with the error message and the subject error notice always went away and 4G worked.