Oukitel K4000 Lite - no 3G signal - Android Q&A, Help & Troubleshooting

Hey,
i have Oukitel K4000 Lite and the phone is normally connected to 3G network,
but the same moment when i want to open youtube or some video on facebook,
immediately disconnect the Internet connection and 3G icon dissapear....
and then i need to restart the phone to get again 3G network...
how to fix this problem ?
Thank you

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