On-screen buttons getting pressed during calls

Hi all,
First post here. I just bought my z2 and I absolutely love it but am deeply disheartened and concerned by one problem I'm having which pretty much is the most important thing I need.
Almost every time I make a call - the mute, speaker, end call or other buttons get pressed while I'm talking. I've tried to make sure that the proximity sensor is covered by my ear and it still happens. I've also run the diagnostics and although they pass I've noticed that the vibration for the proximity sensor test does not always stay on if I put the phone up against my ear and move it around. Eventually the vibration turns off and some on screen buttons are pressed.
Is this a problem with only my Z2 or a design fault. I'm gravely concerned that replacing it with a new one is going to cause the same issue. For a phone that cost me an arm and a leg I wasn't expecting problems that I never had with any other phone.
Please help.
Thanks.

Hi Narada and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
When you are moving it around, is the proximity sensor staying covered? If it is being moved to the point where the proximity sensor is not being covered then this will cause the display to stay lit up.
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"Not to know what happened before you were born is to be forever a child." Marcus Tullius Cicero
Attachments:
IMG_00005833.png ‏1286 KB
IMG_00005834.png ‏131 KB
IMG_00005835.png ‏1592 KB

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Mod Edit: Removed personal information to comply with Community Guidelines and Terms and Conditions of Use.

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Good Afternoon lopakamac,
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If you can't hear a person on a call or voicemail or if the sound quality is poor on iPhone - Apple Support
http://support.apple.com/en-us/HT203800
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Also while you're on a call, make sure that you can see the volume indicator on the screen when you press the volume buttons:
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Restart and update
Restart your iPhone and test again.
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Get more help
If you've tried these steps and there's still no sound or poor sound quality from your iPhone, contact Apple Support.
Last Modified: Feb 11, 2015
Regards,
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On-screen buttons getting pressed during calls

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