# LTE stops working after some time

Source: https://forum.modalai.com/topic/1007/lte-stops-working-after-some-time
Category: ESCs, Sensors and Accessories (https://forum.modalai.com/category/15/escs-sensors-and-accessories)
Tags: cellular
Posted: 2022-06-10 15:11:58 UTC by Philemon Benner
Replies: 5 · Views: 1357

## Philemon Benner · 2022-06-10 15:11:58 UTC

Hey,
i am currently trying to run a video stream on voxl aqp8096 with lte. Video Stream works fine till lte stops working after about 5-10min. Running a seperate shell with ping test also shows that lte looses roaming after this time. Also tried using new voxl and modem, no difference. Also had a look at https://forum.modalai.com/topic/401/lte-modem-works-but-cannot-ping/16?_=1654864994862 but no success either.
Technical specs:
Voxl-Modem Version: v0.14.0
LTE: 4G LTE V2 Modem
Voxl-Version:
![voxl_version.png](https://forum.modalai.com/assets/uploads/files/1654873454567-voxl_version.png) 
Voxl-Modem out(took out lease and select):
![modem_out.png](https://forum.modalai.com/assets/uploads/files/1654873694621-modem_out.png) 
Ping Result:
![ping_stats.png](https://forum.modalai.com/assets/uploads/files/1654873752269-ping_stats.png)

## Reply by Chad Sweet (ModalAI staff) · 2022-06-11 22:07:45 UTC

Have you tried just running ping to test duration? Maybe the modem is overheating or something with video streaming?

## Reply by Philemon Benner · 2022-06-13 08:21:47 UTC (in reply to Chad Sweet)

@Chad-Sweet Thanks for the suggestions. It's actually the lte module overheating, after putting a fan above the voxl it has kept working. Is there anything besides active cooling, that i can do that the lte doesn't overheat?

## Reply by Philemon Benner · 2022-06-14 15:45:27 UTC

@Chad-Sweet so i also ran voxl-inspect cpu in pararlell seems that cpu is overheating too.
![Screenshot from 2022-06-14 15-35-03.png](https://forum.modalai.com/assets/uploads/files/1655221047668-screenshot-from-2022-06-14-15-35-03.png) 
what is the automatic scaling exactly doing ? Can i ignore the cpu overheating, because system continues to run, just lte stops working. Also i am using musl: https://musl.libc.org/ on the voxl for streaming, also i increased the stack-size of the programm to 
10mb ,because the default was too low:
```
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-z,stack-size=1000000")
```
could that be causing the high temperatures?

## Reply by Chad Sweet (ModalAI staff) · 2022-06-14 16:31:41 UTC

The stack size wouldn't have much to do with high temp. It seems you're processing too much on the VOXL. You'll either have to add cooling or slow down what you're doing

## Reply by Philemon Benner · 2022-06-14 16:53:00 UTC (in reply to Chad Sweet)

@Chad-Sweet Ok thanks for your time.