Usage timer/Battery drain since 4.2.1

Before the iOS 4.2.1 upgrade, I owned a very stable handset with an incredible battery.

After the upgrade the phone developed a Usage timer that matched the Standby timer minute for minute. The battery life diminshed much more rapidly suggesting something was running in the background. I shut down everything conceivable, deleted mail acounts and turned every setting off, including Wifi. The only way to stop the Usage clock was to turn Airplane mode on.

I tried a hard reset and resetting network settings without any improvement.

Then I tried Reset all Settings and bingo, things went back to normal...... until... I turned the phone off and back on, which caused the phone to begin playing up again in the way I described.

The simplest way around this is not to turn the phone off and if I have to (which is rare) I need to do a "reset all settings" again.

Programmers!!!! Grrrrrrr..

Any ideas??



Andy

Edited by me because of early morning grammar issues.