Sleep display time out

[Saintmatt]

Sorry pressed submit before logging message. Greetings to you all, new owner of a z1 compact here.
Recently upgraded contract from htc to the compact, just couldn't take to the size of the new htc one and the compact fitted the bill. However i have found one rather annoying issue which on a search have not been able to find an answer to.
During a call the screen goes blank due to the proximity sensor. When the call ends the screen does not come back on and I am unable to either make a further call, end the current one from my end or use phone. There is a screen guard but this does not cover the sensor, and I do not use an attached case as I prefer a pouch style case. I have tried to setting the display time out to 5 mins and 10 mins to see if that helps but it keeps resetting back to 1 min. It appears that the phone does not recognize the end of a call and remains as a black screen. I have tried to be patient and wait for the screen to wake up and tried pressing the power button. Grateful for any ideas. Phone is running kit kat

[alexrx]

Hi there,

Can you confirm that your proximity sensor works properly?

Make sure that a proximity sensor is clean, and then:

Dial(phone app) *#*#7378423#*#* > Servise Tests > Proximity Switch (test it).

Keep us updated.

[Saintmatt]

Thanks for your reply, I did as suggested, tapped on 'proximity switch'. Phone beeps twice and shows a black screen with 'Proximity switch OFF' in the middle. No option to test or turn on or off as far as I can see, just back and home buttons visible. Is this correct?
Regards

[_alexdon_]

You have to cover the sensor and see if it says on.

[Saintmatt]

Oh, yes, that works! So what causes the phone to not wake up when it is removed from ear at the end of a call if the proximity sensor is working, as it appears to be from the test?

[_alexdon_]

I cannot figure out what could be.Usually,if it is not a screen protector or a case,it could be an antivirus or another app.

[Saintmatt]

Ok, thanks alexdon. I do not think it is anti virus as I run avast and do not download 3rd party apps, phone is quite new, under a month old. I will look at my current downloaded apps to see if there is a conflict. There does appear to be an issue as others are reporting same.
Further, my screen display time out keeps reverting to 1 min, each time I set it for longer, it reverts. Any ideas?

[_alexdon_]

Boot in safe mode,see how it goes:

http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008

I suspect avast.

[Saintmatt]

Thanks, will try and see what happens without avast for a few days, and try safe mode also and report back