Probably overheating. I'm facing similar problem. Touched the housing and it was hot. My solution, open up the housing and place a fan on the heatsink

Myself i got it nearly 500mbps and wasn't even full strength signal. I believed when it was below 100mbps, it was running witn only LTE band 28.

LTE band 28 can go far. But N78 can't.


This post has been edited by ameyhazuan: Apr 18 2024, 02:08 AM

yes it will void warranty. just be extra careful not to break the seal. i don't think LED contributing to the heat. I have touched most of the parts and found out that the wireless controller contributing much of the heat compared to other components. I might need to add extra heat sink on that particular spot.

This post has been edited by ameyhazuan: Apr 21 2024, 02:33 AM

i beg to differ. Yes i can agree that wireless broadband not as stable as fiber broadband. But due to our 5G infrastructure currently use in Malaysia, we can't go 5G without LTE B28 and it's on NSA mode. Limitation for single band LTE would be 150mbps. As I observed B28 on LTE modem, it matched the speed of 5G modem when it slowed down. DNB guaranteed the minimum speed of 5G in Malaysia will be 100mbps. I believe it was because of B28 LTE. Should we go SA mode, we no longer need B28 and we should start to use N28 with N78. CA would be possible.

This post has been edited by ameyhazuan: Apr 21 2024, 02:20 AM

I managed to trigger the reboot by overloading the modem. Get few devices to download huge file.

https://testfile.org/

Can use this site to download test file. Get the one with 5GB so it will take few minutes to complete.

As expected, within few minutes the modem first disconnect the internet then reboot itself.

Throughout experience, this could be few things

1. overheated
2. not enough power
3. other factor such as bad hardware or bad firmware

looking at the heat, there was no significant increase during load. using thermal gun, just an increase of few degrees. nothing of concern.

Power wise, I thought I had a breakthrough. I swapped the original power supply which is 12V x 1.5A with much higher wattage 12V x 2.5A from my Linksys router. It worked at first. Tried the download method few times and no reboot. Good sign. Switched back to original power supply and sure enough it reboot after overloading the modem. Switched back to Linksys and to my dismay the modem reboot...

Any other idea? For the time being, I just keep using the Linksys power supply. See if the random reboot still occur.

Last thing I can do is to setup SQM and reduce bufferbloat. At the same time this method can avoid overloading the modem and hopefully can prevent the reboot.

This post has been edited by ameyhazuan: Apr 21 2024, 04:43 AM

All users running with SQM router now. Setting up RRD to monitor internet connection and it will register if the modem reboot. I'll leave it for few days.

I have no speed problem with my zte. Just make sure connected to b28 and n78. Also make sure your connected to wifi 5ghz. Use different SSID for 2.4ghz and 5ghz wifi.



This post has been edited by ameyhazuan: Apr 21 2024, 09:51 PM

Damn..I was tricked on getting this modem. I saw it uses Qualcomm chip. However it was not for the 5G.

5G chipset = Unisoc
Ethernet chipset = Qualcomm

Damn...

then for sure it is firmware issue. swapping power supply did not solve.

I ran out ideas already. SQM did not help. Modem still reboot. However I did try staying on 4G-Only mode. No reboot whatsoever till now. Can't say I'm happy. Speed is less than 100mbps, average 40mbps.

Paying RM72 a month for speed @40mbps, not worth it.

Time to place a report to Umo CS.

If there's no permanent solution from CS. I might need to put my Internet on load balancing. Secondary Internet kick in while the Main Internet rebooting.

This post has been edited by ameyhazuan: Apr 22 2024, 02:19 PM

Done report. They will send a replacement. Choosing Kaon modem this time. Never heard of this Brand before. Not much info available as well. As long as it works and give me reasonable speed, I'm happy.

Eh? why they need to contact back. mine was immediate. they made the report and arrange for replacement. i should get it within 5 days. they will courier over the new modem and swap with mine. i strictly requested for kaon. they put a remark but advice me if still have stock. else it would be zte again.

i don't want zte modem. worried same thing will happen. furthermore, zte modem produces lots of heat. without having a fan, the dissipation aluminum plate on the chipsets too hot to touch.

This post has been edited by ameyhazuan: Apr 23 2024, 02:05 AM

Already stuck with 24 months contract. Can't afford to pay the penalty.

This post has been edited by ameyhazuan: Apr 24 2024, 10:08 PM

walao, you got yours already. mine still no news

now i have to set at 4G. no dc so far but line slow 30-70mbps.

guess i have to force them to send me kaon. by the way, have you report back to them regarding the dc?

have to live with 4G at the moment. since then, never dc. what could be the problem? with 4G only no dc. with 5G will dc many times a day.

Finally got my replacement after threatened them with MCMC. No Kaon, still the same MC888S.

First thing to do, get an old Umo sim and access the modem. Upon inspecting the firmware, it's the same. Still, i disable the auto update.

Then, swap the sim card with the active one. Try to overload the modem with heavy download from multiple devices. So far no dc. Touchwood...will keep monitoring.

End up having 2 ZTE modem 😅

dunno, i asked the courier if i need to give him anything - he said no. anyway, will keep it aside just in case he wants to come and collect.

i just replace the modem. use back the same power adapter, lazy to open the new one.

This post has been edited by ameyhazuan: May 4 2024, 06:00 PM

ok la. so far no dc after so many heavy downloads. speed also reasonable for early evening. hope this solves the problem and the previous modem was just one of the bad apples.

download latency is acceptable. upload has bufferbloat, might need to set sqm to reduce bufferbloat for uploading.

This post has been edited by ameyhazuan: May 4 2024, 06:23 PM