Is anyone else having problems with a changing IP address?

People above not understanding the problem are not reading it carefully. This is NOT about having a static IP. Its that the IP is changing as frequently as every few SECONDS. The wreaks havoc with many sign ins as if your IP changes mid-transaction it invalidates the transaction and you CANNOT LOG INTO THINGS YOU NEED TO. I can solve it with a VPN, but that's a pain. Many services block IP switching mid transaction as a security measure and in other cases programs loose their connection to a server mid application causing errors. It is entirely unacceptable service from an ISP.