Nexus 4 losing signal

Hello,

Lately my nexus 4 has been randomly losing signal, i can't seem to get 3g connecton in some places where i used to. The Wi Fi also appears to be weaker.

Besides that, the power button is also now harder to press and i takes quite a lot of tries to get it locked.

I have tried restarting it, turning on/off both the wifi and the data connection and also i tried reinstalling the latest version of Android Lollipop. The phone has always been running on stock android.

Thank you!