Battery runs out very quicky in iOS 4.0.1

Hello dear supporters.
i'm new here (thats my first messege :)) but i do know a thing or 2 about using the iphone.
(i support all day long in an israeli support forum.)
But I do have a problem:
I've updated to iOS 4.0.1 and since then, the battery runs out so quickly, even in stand by mode i lose about 20% in 3-4 hours.
when i serf on safari and app store, wifi or 3G, i lose like 15% in 30-60 minutes or so.
the same thing when i talk on the phone, listen to music, play games etc.
i've talked to some other guys, they were on 4.0.1 and they downgraded to 4.0 but they still have the same battery problems just like i have. the same problems.
in the other hand, guys who are on 4.0 and didn't update, don't suffer from any battery problems what so ever...
my question is this:
is there any problem in 4.0.1 that leaves a "mark" on the iphone that makes the battery get a little bit hot and run out quickly?
is there any good solution?
iphone 3GS's, some are jailbroken and some are not...
Message was edited by: mr-anderson
Message was edited by: mr-anderson

Me and my friend came to a conclusion and we think that there's a bug in 4.0.1 that makes the modem work 300% harder and therefor the battery runs out quickly, and as you know, modem cannot be downgraded, and yet there's no new modem. So every one who updated to 4.0.1 even for 1 minute is stuck right now with a modem that uses the battery in a bad way.
(maybe it's connected to the signal appearance update in 4.0.1...)
What do you all think people?
Message was edited by: mr-anderson

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