I haven't experienced any network errors on EE as I am on that network myself. If you have recently updated your phone and think it could be that.
I would advise clearing your cache partition, to see if this fixes the issue you're having ill post the steps below now:
To clear your phone's cache partition:
1. Connect your phone to a PC.
2. Turn off your phone (it won't enter Recovery Mode if it's on).
3. Press and hold the Volume Up and Bixby/Power keys simultaneously.
4. Once the Android Recovery screen appears, release both buttons.
5. Use the Volume Down button to highlight "Wipe cache partition."
6. Press the Power button to select it.
7. Use Volume Down to highlight "Yes," then press Power to confirm.
8. After the cache is cleared, press the Power button again to reboot your device.
Let me know if this fixes the problem, if it doesn't we can try other solutions.
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