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Niapegar wrote:

I had great speeds etc until recently.
Now I can only seem to get 4 MB/s.

No matter where I put the device it only seems to get 2-3 bars out of 5.

I’m walking distance from a 5G tower...

So a few questions first. What constituted great speeds for you, on average, and how many bars were you getting when you got those great speeds? For how long were you getting the great speed? Are we talking about this speed drop happening a few hours ago or days ago?

For how long have you been getting this horrible 4Mbps speed?

Have you ever looked at the GUI at 192.168.12.1 selecting Status at the left and clicking on the dropdown arrows to the right of Primary and Secondary, and seeing what bands you are on? If you are only on a Primary band, with no Secondary showing, then that accounts for your snail speed. I have had this snail speed happen to me. But I had it only at first, and for only 5% of the time. I haven't had it in days and I figured out how to avoid it.

While there is a remote chance they are doing some upgrade on the tower, and put you on some lousy equipment, or shifted you to a tower that is farther away while doing this work, there is also a chance you are connecting to a dreaded 4G-only (Primary signal only) band, that just works terribly compared to your 5G connection.

Forget the signal strength for a moment. I get speeds of up to 190 and I am five miles from the tower, on a two-bar signal strength. To understand why I use a two-bar signal location for my gateway instead of a three, you'll need to read some of my other posts, which you can find by clicking on my "badge," the circle with the T in it to the left of this message.

By understanding what bands you are connecting to, using a tower mapper to make sure you aren’t being shifted to a tower farther away from you, you can at least learn a lot of information which might be helpful when contacting a T mobile service person.

If you have a 5G phone or know someone who has one and can try it at your house, then that goes a long way in knowing if it might be a gateway issue. But most of the time, from what I've read, it is not a faulty gateway, because the gateway people often get as a replacement will do the same thing.