Is anyone else having problems with a changing IP address?

Jagwire wrote:

... a guy there suggested taking my T-Mobile gateway router/modem and plugging in another router to the gateway. He said this will give me a static IP address.  Is there anyone savvy enough to have an opinion about doing this?

This may give you a static internal (LAN) address, but it won't affect your external IP address that the rest of the internet sees. That happens between the gateway and T-Mobile's WAN, and due to the nature of the TMHI infrastructure, that's gonna change when it's gonna change. Forum members report that if you get a business account, you can pay extra for a static external IP address, but there are some downsides to business accounts; e.g., some people have reported that they block streaming entertainment services. 

That said, changing IP address every few seconds is not the "normal" IP address change we typically see. Those changes usually occur less frequently, and often when something changes, like rebooting the gateway or the gateway changing 5G/LTE bands. Problems with lease timing, as suggested above, could be at fault, but renewing a lease every few seconds is abnormal behavior, and because our gateway firmware is so locked down, we can't get to those settings.

Contacting TMHI service by phone is a crap shoot, and more often than not gets someone using a script who doesn't really understand telecommunications very deeply at all.  Search on this forum for T-Force via Twitter or Facebook--people seem to have much better luck contacting service that way.  I now avoid the phone and go straight to Facebook chat with T-Force. The reps I connect with actually do seem to understand telecomm concepts, even if they can't always resolve my issues.