Downtime?

[Ace]

I think we would have been told if there was issues.

Very unlikely. Your ISP would not have any reason to tell all of its customers that it was having issues with certain DNS changes. It might not even know. Have you told it?

[beishe8]

Very unlikely. Your ISP would not have any reason to tell all of its customers that it was having issues with certain DNS changes. It might not even know. Have you told it?

Correct.
Changes made to a certain site is not propagating through the whole Internet immediately.
Could take from hours to days.
Your ISP might have several DNS resolvers.
If your IP is dynamic, a reboot of your modem might help,provided you get a new IP from a different range.

[Ace]

Correct.

I know this because my ISP had issues with my own server's IP, till I told them and they fixed it.