Nintendo Switch w/NOK 5G21 Gateway

This is an issue for me as well. Same gateway.

When I first got it, I noticed a few issues but it didn’t really bother me a lot:

• On Steam on PC, I would always get an error for my friends list saying it was not online, but I was still able to play games and I don’t do hardly any party chat so I didn’t really care.
• On the Xbox, UPnP was always an issue, but same thing as PC I don’t really do party chat and I could still hear people in-game so I didn’t really care.
• My Switch seemed to work perfectly fine.

After having it for several months:

• Steam friends list issues seem to be resolved. I no longer get the error and I can see that people are online.
• Xbox UPnP issue still persisted. Eventually I started having MAJOR issues with ping where no matter what I did it was always above 200ms. So basically online was completely unplayable at that point. This lasted about a week before eventually I just said screw it and I got rid of the Xbox.
• Switch network stopped working entirely for no apparent reason, even when I had it connected over ethernet. I got rid of the Switch.

Honestly I would have cancelled my T-Mobile service except for the fact that I'm moving within a year so I can't commit to a contract with another ISP. So I just got rid of my consoles instead and now I only do PC gaming. Hopefully that doesn't fail too in the mean time. I won't be using T-Mobile again after I move.

Lesson learned: Don’t use T-Mobile home internet if you care about gaming.