Fatal power button issue

[AnthonyJ]

Hey there, I have had no problems with my Z2 until today. However, now my screen is constantly flickering on and off as if the power button is being repeatedly pressed, furthermore the window with the options to power off/ restart etc also appear occasionally. I'm unable to power the device off as when I do it will boot itself up again straight away. As you can imagine, this renders the device utterly useless. Has anyone had a similar experience with this? Or does anyone have any fix suggestions? The phone is out of warranty, I'm unable to replace it.

I made a short video of the problem just in case my explanation isn't clear enough.
www.youtube.com/watch?v=5RN5kUC3tyo

Thanks for any help you can offer me, I'm lost for what to do. 

[Thommo]

Sorry to hear this but you would need to either return your device to the place of purchase or contact Xperia care and have your device inspected http://www.sonymobile.com/global-en/support/contact-us/

[Qatrium]

I had the same issue once with my old Xperia Z, after washing it with soap (which is apparently not right) so water and soap got beneath the power botton and caused the same symptoms. It was also out of warranty and I sent it to 3rd party mobile fixing office. They did some cleaning and didn't cost me a lot that time.

[AnthonyJ]

Thank's for your suggestion, though I cannot imagine how water entered the device in the first place. I don't trust the waterproofing on the divice and have never submerged it.