Power button and Volume Up button stop working after the device is charged/warm up

[myhomexperia]

Hello,

My phone had water coming into it, since then the Power button and Volume Up button stopped working

I have noticed that when the battery is very low or the device is cold the buttons work, only after the device is charged the buttons stop working again.

Any idea what to do?

[Uliwooly]

@myhomexperia

I don't know if it'll work but remove both the SIM and SD cards > open all the flaps > leave your phone in a bowl with rice for 1 day 

[Phy]

Contact Sony xperia support to get your phone inspected
http://support.sonymobile.com/global-en/contactUs/