Iphone 4 battery draining while in sleep mode

I have noticed over the past few days that after putting my iphone 4 into *sleep mode* and not using it for several hours that the battery percentage is significantly lower after powering it back up. I first became aware of this after waking up to find my battery was at 50% (8 hours before I went to sleep it was 90%). Just today I was using my phone and the battery was at exactly 85%, I turn it off and an hour later I check the battery at its at 77%!!! I then go for a 45min run (leaving the phone at the house) and coming back I see that it is at 73%.
I don't know if this is a battery issue or a problem with the wifi/3g working when the phone is in sleep mode. My parents both have the 3GS and they do not experience this with their phones.
I have had this phone for 2 weeks and I don't want to have to send it back so please tell me this is a software/settings problem and not with the hardware!!
I haven't changed any settings or downloaded any apps since I got the phone (Except for the free case app). I did however sync my email address with the phone so it may be a problem with that I don't know.
I am also on the original firmware that came with the iPhone 4 I have not updated that yet.

ehanger wrote:
I think it had something to do with the signal being weak. I normally keep my phone in the basement where my computer is and often there is only 1 bar or no service at all. In order to make contact with the cell phone tower the phone has to work harder therefore using more battery. I put the phone upstairs in my room last night where the is better AT&T signal and my battery has not dropped off at all.
That could be the issue. Your phone is only getting 1 signal or no service, and is trying to work hard trying to find good service in your basement. Try setting the phone on the first floor where you get good signal and see if that fixes your battery issue,.

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    ==========                ======              =======                                                                    ========  =====    
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    Hi Marvin,
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    Spoiler (Highlight to read)
    Spoiler (Highlight to read)
    Spoiler (Highlight to read)
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    Did someone help you today? Press the star on the left to thank them with a Kudo!
    If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
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