Internet connetion constantly dropping

When I first positioned my Nokia and received the best signal in our upstairs kitchen window I also found a curious behavior where IN the window was not as good as what one would assume to be a lesser placement in relation to the tower. My theory on the behavior was reflection of the signal off the opposing cabinet. It made little sense other than signal bounce. When facing the window the and looking E/NE, the tower is due North. If the router was to the left of the window the bars would go up by one, usually. If the router was placed to the right of the window where line of sight to the tower exists the bars would drop by one. So, I can only theorize that signal bounce may play a part. I am not a cellular expert but I have done a fair amount of research on the matter and I have a background in networking support for 22 years so hopefully this helps out.

• rsrp dBm: -69 ← Is in the excellent range (better value/representation for strength of the signal than RSSI)

• rsrq dB: -5 ← Is also in the excellent range

• rssi dBm: -64 ← Reflects the signal strength received (Good)

• sinr dB: 13 ← Is top of Medium or bottom of Good range 

So, signal to noise ratio is not bad but not stellar. What the RSRP and RSRQ do appear to reflect is that the tower must be fairly close to your location. The signal to noise ratio tells us that there are factors that cause noise for the signal. If the SINR were >=20 dB it would be excellent. Value of 13 not great but not bad.

So, with respect to the signal drops. If you run continuous pings to say quad9s 9.9.9.9 or Google 8.8.8.8 if the "drop" takes place the loss of the responses from the Quad9s and Google DNS servers would be apparent and would tell you the cellular has dropped. With the command to get the values out of the Arcadyan server for the cellular metrics would reflect if both the 4G LTE and 5G NR signals dropped or if only say the 5G NR signal dropped. I found if the 5G signal dropped the transition to 4G LTE was interrupted and was not very dependable. Once T-Mobile finally ironed out the operation of the equipment on the tower then those problems have pretty much gone away.

If you are getting drops that repeat multiple times in a day it is still worth making a call to T-Mobile support to ask if there is work being done on the tower equipment. They tend to do so during normal business hour in the day. If that equipment is being upgraded or worked on or just is having problems if others on the same tower DO call in then it is more likely to get attention and a response. Sure they should have monitoring of the equipment but unless someone sees the alarms, if they are set up, then nothing will be done. 

Regarding the Roku. It is worth looking at other conversations in the T-Moble community for ROKU as it is a Roku thing. T-Mobile does not establish a static external IP address for the router connections. So if the external NAT address of your router changes, for one reason or another, then it causes problems for a Roku. From what I have read that has to be worked out with Roku support. Some users may have resolved the behavior with the use of a VPN. However, if you changed from another ISP to T-Mobile and now are seeing the Roku not work then contact Roku support and ask about this. I believe, from what I have read in threads, that they can refresh the server end for the account "connection" to the IP on your end and get it working again. Of course that could change again so well you would know the drill. Hopefully T-Mobile will establish a practice that either extends the DHCP address duration to infinity. They don't want to have to maintain static IP addressing as more administrative overhead. If you make a long lease time for the IP addresses in the pool then it would have less impact on the end users.

Another good source for answers or clues is on reddit. There is a subreddit just for T-Mobile conversations and there is a great many conversations going on. Some good and some just rag sessions. Go for the conversations with helpful content and just ignore the trash talk. Well, that is my take as that gets you no where and the content with answers is what helps out.