The problem always is resolved only after reboot (on/off flight mode does not help, as well as sim card reconnection),
After reboot the network finds always.
After detailed learning of a problem, was found out, that the network is not disconnected when XT890 is connected USB by cable to PC.
There are also some other alterations the operation of the product XT890:
If you compare it with the normal operating device, on the device which loses a mobile network, the screen is not locked (the sensor control ceases to react to tangencies) after connecting of the charger or USB a cable.
(On this device before appearance of defect and on the second similar device,when it is connected at the charger or connection USB - a cable to PC, the sensor screen does not react to tangencies).
At switch-off of a USB-cable the device there and then starts to search for a GSM-network. Finds, but for a short while. After switching off of the screen and repeated switching-on after 15-20 seconds the network is already disconnected. In a monitoring drawing it is displayed that in sleep-mode networks were not.
Three apparently experienced firmware device
- Android 4.1.2 Blur_Version.91.2.26001.XT890.Retail.en.E
- Android 4.1.2 Blur_Version.91.2.29001.XT890.Retail.en.G
- And even
- Android 4.1.2 Blur_Version.91.2.26001.XT890.Vodafone.en.F
The result does not change.
I ask your help