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Did mine Thursday evening. Battery went from 98% to 1% overnight(12 hours). Mediaserver usage was 59%. The only thing I had done after upgrading was play a couple of games of Angry Birds. Have tried it since and still same but if you Force stop the App after finishing game it solves problem. Hope this helps somebody else.
 
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There are few who leave an iPhone 4 and try and adopt the Android... Well few that I know of anyways. I am one of them.

I bought an arc s with the 2.3 running - it had its issues but the experience was comparable to the iPhone. I have upgraded to ICS last week and everything seems very unresponsive and slow. Something is not right, I think I will have to reset it and try a fresh.

Does anyone have a better solution?
 
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The update looks pretty slick but battery life is suffereing. Cannot find out how to root 4.1.K.0.5 though, only 4.1.A.0.562, can any uk users help point me in the right direction with this please? Looking to root to give better control over the power and hopefully extend the battery life.
 
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i have upgraded my arc s to 4.0 (ICS) yesterday through pc companion....i will suggest please do not update your phone as i am having many problems with my wifi signal strength...the game 'temple run' over there the touch signal is not ok at all like if you want to swipe right or left it does jumps....seriously i am very much worried...anyone who can help please reply....
 
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I have upgraded. Battery drains rather quickly (I cannot compare since I bought the phone and immediately upgraded - with relatively low activity the battery runs out within 12 hours). But the main problem I have and I see lots of others complaining on the Internet is that the phone will not pair with my car's hands free bluetooth device.

Since there are many who suffer from this, how do we get SONY to fix this?
 
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