Does your issue happen on WiFi or Cellular or both? What is the quality of your signal?
Make sure your Republic Wireless and Republic Telephony Apps are up to date.
Here are some self-help troubleshooting steps
- Clear your cache and see if that fixes it.
Clearing the Cache
- Run the phone in Safe Mode
If it works better in safe mode then it would point to one of your downloaded apps causing the issue.
You can try to delete them one by one starting with the most recent to see if that clears it up.
- The last resort option is
If your issue survives a Factory Reset then you are probably looking at hardware failure.