have T-Mobile as my home internet provider and I deal with this fairly often.

I have the same ISP and the same issue. I believe a lot of the issue is that T-Mobile uses CGNAT on their network. This means that your public IP is shared with a lot of other people and it means your “location” (based on your public IP) can jump around from time to time. I’ve had Netflix get bitchy about this before as my connection seemed to be coming from Maryland instead of Virginia and their records indicate that I’m not a terrible driver.