IPhone turning off during Phone Call with iOS 4 and very slow performance!!

Ever since the update, my phone has been switching itself off during a conversation.
Has any one else experienced this problem since the update???
Do you have a solution, if so please post it and help me!!!
Also, the phone has been going very slow.
Keyboard appearing 20 seconds later, after opening a new note and overall slow performance.

Thread here :
http://discussions.apple.com/thread.jspa?threadID=2471090&tstart=15

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Iphone turn off during phone call

Hi, my iPhone 3GS (with iOS 5.0.1) turn off automatically during normal phone calls (i.e. without hands-free talking) after approx. 5 minutes. After a couple of minutes the iPhone come back to the normal "standby" situation, i.e. I can press the home button and unlock the iPhone to do everthing like normal (without any long phone calls). When I am using hands-free talking (like in the car) the iPhone is working as expected without any malfunction.
This effect was shown up at each call (> 5 min.) since the update to iOS 5. By using of iOS 4 the iPhone has worked as expected.
Who knows about this effect and possible solutions to fix it?
Kind regards, Frank

Connect iPhone to Wall Charger for 10 minutes, it may turn ON itself. If still nothing, keep on charger and Reset, hold both home and power buttons for about 20 seconds until the iPhone begins to respond.

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Thanks for sharing.
Are you asking a question here?

My 4S iphone keeps trying to turn off during phone calls and drops the calls. Sometimes I have to call back 3-4 times to finish a conversation.

While talking on my iphone, the phone tries to turn itself off. Not just once, but continuous, and not just dropping the call, but actually tries to turn itself off.

Well, then I'm glad this is most probably not a hardware issue - at least not an exceptional, maybe defect of all? -. This seems to be a good idea, because 2G will nearly everywhere available, so phone calls are not likely to drop at all. I'm just a bit confused, because they promised intelligent switch even during calls. For me that means that if the better, faster connection is available, then it uses that, and if it wouldn't be, then it switches to the slower one.
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KBurd,
If the proximity sensor is covered by a case, your hand, or by being close to your face, the screen should go dark and unresponsive, but the call should not be disconnected.
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Thank you! I'm glad I'm not alone. I've had my pre for about 6 weeks and I love it. So... I bought an INVISI-SHIELD for over $20 at Best Buy. Then the flickering and blank screens started a few days later. The only difference was the new protective, invisible, EXPENSIVE piece of plastic - so I trim it back to just the face (assuming it was a side sensor glitch) but it still didn't stop it. So I peeled off the skin tonight and it seems to be fine... for the time being.
A WARNING would've been nice before I spent my money. I want to be reimbursed by Sprint! Thanks community - it was nice to get help from YOU!

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If still a problem restore with your backup.
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http://osxdaily.com/2013/09/23/ios-7-slow-speed-it-up/
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IPhone turning off during Phone Call with iOS 4 and very slow performance!!

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