Hi
andrahenThank you for asking. Kindly provide the information below so thatt we can better assist you:
1. Your firmware version: Setting >System>About Phone>Build Number
2. What woulf happen once this issue appear? Could you recieve call/text and use the internet/wifi or not?
3. Did the issue suddenly happen or after any firmware/app download/update? Please try to reset Network: Setting>System>Reset>Network settings reset