4g not wroking after waking up from sleep

Gwinambele

Hi
I have a problem with 4g.
After night (about 12h) when i launch dudu 7 unit from sleep mode there is no 4g. But like its not enabled at all. I use this menu that appear when you slide from top screen, i click on mobile data and its grayed out and there is no mobile data icon (even not connected aka 0 signal bars)
I have to restart device to make it work (sometimes even twice)
When im at work (for like 8-10h) and i launch dudu unit from sleep everything is working fine.
I have lastest OTA system.
Any idea what could be a problem?

DUDU-Meng

Gwinambele
Please confirm whether the issue is that the card has no signal or that the SIM card isn't being detected at all.
If the SIM card isn't being detected, the problem lies with the SIM card slot. You can try placing a piece of paper to increase pressure or try a different SIM card slot.

Gwinambele

It's not detected.
But it's working after 8h and not working after 12h.
It's really wierd.
Today it's not working at all. It because there very cold outside?

DUDU-Meng

Gwinambele
The issue lies with the SIM card slot. Please check this area first. Thank you.
The problem with the SIM card slot is that it may fail to detect the SIM card after the device has been powered off overnight.

Gwinambele

When I heated up my car and restart unit I is working. So it looks like low temperature is causing the problem.

DUDU-Meng

Gwinambele
It could also be caused by low temperatures, but it's also possible that the SIM card slot is affected by the cold. You can check the SIM card slot.