Greetings all, After updating to 4.0 on the 22nd of June I had severe issues where the iPhone would essentially turn off whenever the display turned off. If it was on the mains it would be fine, otherwise it'd do this, require a reset and claim it was on 20% battery (even if it was actually fully charged). I deleted the update file on my laptop and redownloaded which didn't fix initially but then suddenly it worked fine. However I let the iPhone run out of battery yesterday accidentally and now the issue is back. I've tried restoring without backups, new files etc and its still doing it. Any help? Thanks.