Home internet modem keeps powering down and restarting

Yes, I have always adjusted the channels used for both bands on my TP-Link router as auto threshold to change channels must be pretty high letting it sit in fairly congested channels. I moved them away from T-Mobile modem/router I determined from an app on my phones/tablets and turned off one band as well. Of course, cannot access wifi band channel settings in T-Mobile modem/router. I moved the T-MObile device back across the room at least 12' from all electronics. Once it started rebooting issue it did not seem to matter much.

Topic states solved but I see no solution?  So, I was having the same issue, gateway rebooting on it's own randomly a few times a day.  Saw another topic and tried this.

If this is happening to you, do you have 2 or more WIFI networks setup?  I did, and here's what I did.

First one, was TMOBILE-GUEST and the second was TMOBILE-MAIN.

BOTH were setup as Freq Band as Automatic.

Fix was, I changed the GUEST to be 2.4 GHz and MAIN to 5 GHz.

Important things, like my work laptop and TV’s use MAIN and my kids/phones/computers use GUEST.

Not sure if some type if conflict was going on, but since doing this, I have had no problems with rebooting or loosing any connections.

Separating modem and my wifi did not help. Returning unit before test drive up.

We have had our T-Mobile 5G gateway about 2 weeks.  Today I noticed the spontaneous restart for the first time.  We lost network connection and because that was a common occurrence with our previous provider I didn't pay much attention.  A while later I noticed the uptime was about 2 hours when it should have been several days.   I'll keep an eye on it.

There are problems with the app.  It does not show the uptime as near as I can tell.  But if you load the IP address of the gateway in a web browser you can get that information.  Uptime displayed in the app would be helpful.  It would also be nice for the gateway to log events like restarts and other messages then show the log entries in the app.

We'll see how this goes.  Hopefully the event today was an exception and not an indication of things to come. 

Mine connects and works fine… for awhile… then reboots… not as bad as that update… but reading these comments it looks less like s/w and more like hardware issue of some sort…

rbunce wrote:

I have had a Sagemcom 5G Home Modem for just over a week. For the first week it worked fine. I had it across the room on top of a cabinet with no other electronics in the area. I moved it to other side of the room in the corner with all my A/V equipment and next to my wifi router I am going to use instead of built in router where I cannot change or even see most of the settings. As soon as I did that the Sagemcom 5G Home Modem started randomly restarting and even reset once. Last night I moved Sagemcom 5G Home Modem back across the room and it was fine again. This am I placed Sagemcom 5G Home Modem lower in the same side of room in front of a window and moved my modem over to that side of room but up high on top of a cabinet. Ran an ethernet cable between the Sagemcom 5G Home Modem and my modem. So far so good. Through all of this the indicated signal on the Sagemcom 5G Home Modem has been Very Good.

Could this issue be RF interference?

Could be a recent firmware update.

Bad Firmware Update Bricks Over 30k T-Mobile Home Internet Modems

I have had a Sagemcom 5G Home Modem for just over a week. For the first week it worked fine. I had it across the room on top of a cabinet with no other electronics in the area. I moved it to other side of the room in the corner with all my A/V equipment and next to my wifi router I am going to use instead of built in router where I cannot change or even see most of the settings. As soon as I did that the Sagemcom 5G Home Modem started randomly restarting and even reset once. Last night I moved Sagemcom 5G Home Modem back across the room and it was fine again. This am I placed Sagemcom 5G Home Modem lower in the same side of room in front of a window and moved my modem over to that side of room but up high on top of a cabinet. Ran an ethernet cable between the Sagemcom 5G Home Modem and my modem. So far so good. Through all of this the indicated signal on the Sagemcom 5G Home Modem has been Very Good.

Could this issue be RF interference?

Um. I'm an electrical engineer. I troubleshoot hardware for a living, at least until recently when I retired.

Brand new T-Mobile Gateway, the tall, square in cross-section one. Started seeing $RANDOM dropouts, once every couple of hours, as soon as the thing was put in use.

On day, happened to be in the office upstairs where the thing was placed, down went the internet. Looked over, screen says, "Powering Up". There had been no power outages whatsoever. When it came back up, so did the internet.

Four hours later, lather, rinse, repeat. Called T-Mobile support. After the usual five minute wait, talked to a nice service rep.

Se said it was clearly a problem with the gateway. AND that that particular brand (the tall one) was known to have this problem. Drop shipped me a new one on a Friday, got it on this last Monday. Opened the box: Same rough shape (square in cross-section) but shorter than the original. Set it up. No more drop-outs.

Did have to swap the SIM card from the intermittent one to the new one, but that was it, beyond the usual setup follies.

Could be the power brick. But, speaking as a troubleshooter: I've seen hardware that does stuff like this. A fair number of reasons. Overtemperature on some device that causes excessive current draw; reset sensor whose voltage thresholds are too high/too low, so it causes a reset; bad parts in manufacturing that short out intermittently; and so on. I note that it took a while before it started doing this in my case, at least four or five hours. Most factories power up their equipment, sometimes in a heat tent, with the intent of detecting early failures. So this looks like a factory escapee: Should have been caught during testing, but worked long enough to ship.

There’s this general idea: One can do a mucho of testing when one builds a product. Testing the circuit board, lot testing individual components, testing the assembled board before putting it in the box, testing the complete box after assembly (functional test), and, of course, heat tank testing. If one is getting 99%+ yields at a particular test step and there's decent fault coverage, it's often cost-effective to skip some tests and use others. This works if one's suppliers provide low-fault batches of hardware; one pays more for that, but then gets to skip hiring people and mounting test stations, so it's an interesting balance for the manufacturing engineer.

But there are pointy-haired bosses who just love skipping testing steps in the interests of low costs.. and this smells of that.

Having the same issue here… just started service a little over a week ago and our tower has power cycled numerous times. At first I thought maybe it was doing updates ( odd to do that without any warning or in the middle of the day/evening, but….. )   Anyway…. I'm glad to see that it isn't just me.  I will be calling or stopping by a store. 

How has it gone since then?