Home internet modem keeps powering down and restarting

I have had my 5G Home Internet with a 5G Gateway (white one) for right at 2 months. Within the last week I started having it disconnect and then reconnect.  Today it disconnects and the Gateway gives the "Unsupported SIM detected…. [Error Code SIM0003]" message. Can't seem to find anything online that gives me information on this error.  Guess I will have to call support but hate having to sit online with them.

Hi, we have tried to find all possible reasons for T-Mobile's T-Mobile Gateway Keeps Restarting and have tried to collate all technical fixes aquí to sort out the issue. I hope it helps you to fix the issue smoothly.

@MikeyD28655,  "I guess I'm going to have to hunt down the ceo myself and corner him on one of his visits and ask him what the hell. We are tired of spending money on his garbage for it not to work properly and that he is not going to walk away from this."

What about simply finding another ISP? You have a monthly contract with TMO Home Internet and you can terminate it at any time. I think this would be a simpler solution your internet issues.

As with others here, My nokia gateway (the trashcan model..and on my 2nd one already rebooting randomly and losing wifi. same as the previous), I am sick and tired of the bs and policies that say I can't switch to another gateway nor can I speak to or even email the ceo of these issues. I guess I'm going to have to hunt down the ceo myself and corner him on one of his visits and ask him what the hell. We are tired of spending money on his garbage for it not to work properly and that he is not going to walk away from this. People are way past being tired of ceo's getting away with cheating people. I think we all deserve at least a years free service at this point not to mention t-mobile's tech dept knows little to nothing about gateways nor networking. Also, a class action would get some attention as well.

Mine restarts roughly every six hours. New Arcadyan, the black box. 

Yeah, I have been a T-mobile customer since 2004. I have been dealing with this for about a 6-8 months. The best solution is to change services to a company that has dedicated support to both the service AND hardware. T-mobile cannot fix this because they have nothing to do with the elements of the hardware to understand where the issue is. I company that is actively investigating an issue with hardware would have specialist that would also be able to diagnose an ongoing issue. T-mobile does not. T-mobile will take your money and make you deal with the headache. I'd advise to stop giving them money for the internet.

I will never recommend T-mobile to anyone ever again because of how stupid they treat me, and how much I have literally lost in funds because I work using the internet. My job and my company's work is impossible to complete without constantly running internet system. The amount of issues I have had is more than I have had in almost 20 years of phone service. I'm leaving t-mobile. Bundle anywhere else there is a dedicated hardware team, not random phone people from any random place that have no clue what's going on.

Right now, T-mobile's priority is to expand customer-base, not fixing current customer issues. They have become arrogant as a structure. I am bundling with a completely different company, and moving my business to a more reliable network system.

T-mobile does not care about fixing this, otherwise they would have stopped using the current hardware they are using. But notice that all the complaints include being sent the same router over and over. That's how stupid T-mobile treats us. T-mobile does not think its customers are intelligent. That we can be strung along.

If you want working internet just go to a company that has a solid system. This may come with a subscription but you're paying for service so get service. Don't pay for a reseting box that causes you stress.

The gateway worked great for the first two days but now it just shuts off and stays off without any warning. This seems to be a common complaint, has anyone had good luck with these? 

On these cell metrics. With my

Nokia gateway before sagecomm my sinr was 4 or blank. 

This is speeds with sagecomm gateway 4/5 bars in my area