Even though there is a massive thread, and this has been asked many many times, i will cooperate.
I had my i5 replaced a few times. the first replacement i received was an F2 serial. It had a flickering screen and terrible battery life. I never restore from a backup. I keep the screen brightness on 80%. i was getting just under 4 hours usage with the F2. I used it for 4 days. tried many things. No good.
I then got that replaced again because of the screen mostly. I got a DN serial.
Everything was just as it was on my original launch day i5. No screen flicker, and 7 hour battery life.
So, i believe you should swap your phone for a replacement before you "jump ship".
I had my i5 replaced a few times. the first replacement i received was an F2 serial. It had a flickering screen and terrible battery life. I never restore from a backup. I keep the screen brightness on 80%. i was getting just under 4 hours usage with the F2. I used it for 4 days. tried many things. No good.
I then got that replaced again because of the screen mostly. I got a DN serial.
Everything was just as it was on my original launch day i5. No screen flicker, and 7 hour battery life.
So, i believe you should swap your phone for a replacement before you "jump ship".