Samsung NOTE2 will automatically disconnect when downloading data.

According to your description, I suggest you refer to the following:

1. The movement data of the top curtain is turned on, and the WLAN switch is turned off.

2. Ask the operator whether the data traffic service is temporarily closed.

3. If conditions permit, replace other SIM cards for testing.

4. Settings-More Networks-Mobile Networks-Access Point Name-Menu Key-Reset to Default Settings

5. Try turning the machine on and off again.

6. Check whether it has improved after updating the mobile phone system version.

7. Back up mobile phone data (phone book, SMS, multimedia files, etc.). ) and restore the factory settings.

If the fault still exists, it is recommended that you send your mobile phone to the nearest Samsung service center for testing and maintenance.

Please click the following link to find out the specific location of Samsung Service Center:.

It is recommended that you apply for "booking to the store" in Samsung official website and enjoy priority maintenance service:/pre-order.

After the appointment is successful, please bring your machine, invoice and warranty card to the service center you reserved on time.

If you have any comments, suggestions and comments, please click: support.samsung.com.cn/survey.