Delay when pressing power key

[Polly13]

I've noticed that, when I press my power key to unlock my phone, there is a (seemingly-increasing) delay before it actually happens.

[Uliwooly]

@Polly13

This is probably due to you removing the back cover

http://talk.sonymobile.com/t5/Xperia-XA-XA-Ultra/Back-cover-removal/m-p/1185967

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@Polly13 wrote:

... I'm trying to remove the back cover so I can take the battery out, and it feels like I'm damaging the phone! Shouldn't it just pop out or something?

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@Polly13 wrote:

The battery is non-removable?  Nobody told me this,...

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Get your phone inspected by your Local support 

[Polly13]

Well, for a start, I never actually did remove it.

Also, that was a month ago; this delay issue has only started in the last couple of days.

[Uliwooly]

@Polly13

Either or, contact your Local support to get it inspected, if you indeed removed the back cover it will void the warranty.