Galaxy S4 randomly drops network connection
My Galaxy S4 is driving me crazy. I bought it 5/29/13. It worked flawlessly for almost a year. On or about 5/20/14, it started losing the network connection with no warning. I could not make or receive calls or texts. I mean NO warning. One second, it worked fine then the next - nothing. I would have to restart the phone to get it to connect. I started missing calls and texts, which makes the phone basically useless. I would have to restart the phone to get it to connect to the mobile network.
The phone began intermittantly showing an error message that the sim card was missing. Since the sim card was an old one from my previous phone, I went to the AT&T store and a nice Rep replaced it at no cost. This was on 5/22/14, a week before the warranty ran out. The rep told me that if the problem persisted, then it would be the device, not the sim card. She gave me the address of the AT&T Device Support Center and told me that I should take it there if the phone kept malfunctioning. She also suggested that I just warranty the phone out and get a new one. I stepped outside and called my wife who informed me that she had just called and it went straight to voicemail. The phone had malfunctioned again right in front of the AT&T store!.
The next day. 5/23/14, I took the phone to the Device Support center and they replaced it. So, I have a new phone with a new sim card. A few days later, it did it again ; the phone lost the network connection and could not make or receive calls. The wi-fi worked fine so, hours went by before I realized that the phone could not receive calls or texts. On 6/19/14, I took the phone back to the Device support Center and explained the problem. They referred me to Samsung and gave me a map to the Samsung Repair Center, RSI Inc.
At RSI, I was told that they have seen this before and they would have to reformat my phone and reinstall the OS. They also told me that they are only having this problem with AT&T phones. I backed up my data and let them proceed. So, I have a new phone with a new sim card and a fresh flash of the OS. IT IS STILL MALFUNCTIONING!!! The phone will silently and randomly drop from the network with no error message or anything. The one thing I have found is that I can make it reconnect by toggling on and off "airplane mode", which is faster than rebooting the phone.
I had a chat session with a Samsung technician who basically tried to walk mw through reseting my phone. How much more "reset" could it be than refomatted and flashed with the latest software? The "technician was useless and wasted my time. I think the problem is related to the last Android update. The problem started a few weeks after the update.
Does anyone else have any ideas?