Proximity sensor failure

I've been using my Xperia Z1 for some time now, and since the latest update, I have noticed a few strange problems.
1) the screen will suddenly go very dark, and gradually increase to maximum brightness. This happens when I'm playing Dragons - Rise of Berk, or Knights and Dragons. Don't think it happens when I play Jetpack Joyride or Crazy Hill Climb.
2) The ear proximity sensor doesn't seem to be working when I make calls. My display is still on even though I hold the phone flat against my face during calls. Doesn't matter if it's on the right or the left side.
3) the backlight on the screen remains on, even though I press the power button to shut off the screen. This is also another indication that a problem has occurred.
4) I suspected that this might be due to a faulty light sensor or proximity sensor and ran a diagnostics. It shows that the ear proximity has failed.
5) starts working properly as soon as I reboot/restart it. But if I leave the phone on standby after a period of time, the proximity sensor fails again, forcing a restart.
6) phone occasionally gets very hot for a short period of use(under 5 minutes), and remains hot to the touch. To the point that it gets uncomfortable to have the phone in my pants pocket due to the heat.
Do note that these problems only surfaced AFTER I updated the phone to the latest firmware that was prompted on my phone update program.
Is there anything that is being worked on to have this resolved? Or, is there anything that I can do to fix it?
Solved!
Go to Solution.

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
I suggest that you boot your phone into safe mode to see if you experience the same behaviour:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
Otherwise, I suggest that you perform a software repair on your phone via PC Comapnion to exclude software related problems:
http://www.sonymobile.com/global-en/tools/pc-companion/
In PC Companion you press start on Support Zone > Start on Update the phone/tablet software > Repair phone/tablet (the blue clickable link in the message) > Follow these steps without having your device connected to the PC.
Follow the instruction that appears in the program and do not connect your device until this guide tells you how to connect it.
- Official Sony Xperia Support Staff
If you're new to our forums make sure that you have read our Discussion guidelines.
If you want to get in touch with the local support team for your country please visit our contact page.

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Same issue already several weeks.
And we are not alone:
http://forums.crackberry.com/blackberry-z10-f254/proximity-sensors-still-not-working-my-z10-891783/i...
At all there is, I think, 4 threads in parallel about this issue at CB forums. One of the:
ms.crackberry.com/blackberry-z10-f254/proximity-sensors-still-not-working-my-z10-891783/index5.html
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Thanks for the information. It seems that you have installed an OS version higher than the one supported by your carrier on your device. Please contact your carrier to get the supported OS version and try the proximity and light sensors. Let us know if you need further assistance. Cheers. ^LFC.
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You are confused me. Phone got updates over network automatically. On crackberry forum a lot of people from different countries and with Different OS version, but with the same problem. Hi, this is thread at CrackBerry: http://forums.crackberry.com/blackberry-z10-f254/proximity-sensor-906493/index3.html
This my replay was 22 of march. No more answer from BB.
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http://supportforums.blackberry.com/t5/BlackBerry-10-OS-Device-Software/Upgrading-OS10-devices-using...
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I have taken it out of the case - I figured it would obstruct the sensor (also have no screen protector).
Only thing I haven't tried from the Basic troubleshooting steps you mentioned was to "restore as new".
That I did try it tonight (succesffully restored), BUT my problem still exists.
You mentioned to go in the MAC store > Would they replace it (for free) if they reach the conclusion it's some sort of manufacturer faulty wiring even if it's a 3Gs (as an old model)?
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hi,
phone works great but when on a call proximity sensor kicks in turns off the screen. When I pull the phone away from my head screen is still blank. The force hangup/lock is the only way to bring the screen back on.
I purchaged it before one month onl. So i wont understand how it comes. Please help me. I am waiting for you reply.

"Your face is so ugly, it broke your phone!" Ha ha. Get it? How I was joking there? About your iPhone not working correctly after... <sigh>
But seriously, you said the situation only happens when you have been on a long call, so maybe the iPhone is just autolockng?

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