5G Home internet keeps dropping!

I have had the same problem. Good reliability for the first month or so and then started dropping out for an hour or two at a time. A week or so ago it dropped out and did not return. We were gone for the last month or so with our motor home. I'd call tech support and all they could offer was to rest the gateway which obviously I couldn't do when not home, We returned home a couple of days ago and I promptly called Cox to reinstate our internet service, I then called T-mobile to cancel my internet with them. They asked why and I explained that I needed reliable service for my thermostats, security cameras, etc when we are traveling. After I said that they said no problem and proceeded to process the cancellation and sent me a return label for the gateway. The fact that they made no effort to convince me to stay makes me believe that they know their service is unreliable and there is nothing they can do about it.

My connection was generally good until yesterday. Tech support have not been able to help, in part because my calls (through a T-Mobile MNVO keep getting dropped).  To me this suggests problems with the tower--but what do I know? One tech asked me to do a factory reset (no luck). Another tech on a subsequent call asked for my IMEI and said that they did something, though it didn't work either. I just tested my Up/Down on OOKlA 18 Mbps down and 24 Mbps up.  

I am in the San Fernando Valley, so overheating could be an issue, but the problem began in the evening and when I had WiFi turned off via script.  

May have found a solution!, Forgive me for not knowing the technical terms. I too have experienced the speed and dropped connection. Worked great for first week or two, then 200 mbps would go to 3.0 mbps. My signal is good to very good. 
 

Today I moved the unit to the side of the house the tower is on knowing that I couldn't receive a signal to the other side of the house, but then I remembered I had installed a Unifi access point about a year ago to connect to my Spectrum service. Fired it up and wow! Speed is 240mbps down, but then I went back to the unit and my phone lost the access point signal and connected direct to the T-Mobile unit. Speed test was 25 mbps. Obviously the problem is the WiFi inside of the unit. Try connecting to the Lan connection!

Also the signal strength is unchanged from where the unit was originally located.

Please read and respond if the link helps you.

I had a bad day today. Two conference calls on Zoom and Microsoft teams. Disconnected in the middle of both calls. I had to use my trusty reliable Verizon hotspot to continue with my call while rebooting the Tmobile home internet service.

I do not think this service is fit for business use. I am looking for alternative ISP at the end of this month.

Also have frequent cut outs and drops.  Likely firmware or hardware of "modem."   Modem screen shows connection, but neither wireless nor wired connected devices show an Internet connection.   It might also be their equipment connecting to internet on the system side.

Annoying and not what I contracted for.

My end result is the same - devices connected to the gateway but no internet. However, my issues do not occur throughout the day - only in the middle of the night when there is no activity. To me, it is almost as if the gateway (Arcadyan) is going into a sleep mode and losing the connection to the tower. After I reboot the gateway in the morning, it will be fine throughout the day. 

I first reporting this issue several weeks ago and was told they were upgrading towers (Later discovered this is standard response when they don't know the answer). When this continued, tech support seemed perplexed. I offered a temporary solution of adding a feature to the app where we can schedule a reboot at a specific day/time. They ignored me.

when I called back in last week, I was told they are aware of the issue and  the engineers are working on this. Was told it was reported within the last few days - told them I had been reporting this same issue to them for 6 weeks. Now they want me to take notes on the error codes (there are no codes on the gateway or within the app). Guess I am now an unpaid member of their tech support.

This is getting frustrating and If this was happening throughout the day to me, I would be looking for a different provider. 

I cannot argue with that. I am so glad my Nokia still has the web GUI for management. The mobile application is a poor solution for gateway management. 

Ours does the same thing, when I called about it, the lady said they were updating and that it would never happen again...needless to say it's still happening

Mine is the Nok 5g21.  It started to do what everybody complained:  Dropping connection-reboot-work for some time and do it again.

Did the following:  Switch it OFF, extract the SIM card (it had a nice fingerprint over the "gold" contacts, dark of dirt!).  Cleaned it with a rubber eraser and rubbing alcohol, Reset the unit with the small reset button.  Turned ON.  After two days now and it has not failed.

Not to say problem solved as time will tell.  But, what kind of people are installing SIM cards on these units?  Not to divert from the main issue, but anybody knows why T-Mobile restricts access to Port 21  ??  My gateway and cell phone can't, but Verizon does work.