I have a Samsung J7 and am on Android version 9 after software update last week. Initially everything seemed fine but now I have no network connection. Went through all trouble shooting items (except SIM card) and after factory reset I had a network connection again. That lasted until I restarted the phone and again lost the connection. I did another factory reset and have a connection again which I hope to keep by NOT restarting the phone. Is there a fix for this?