My power button got harder and harder to press over time, eventually becoming completely impossible. The repair was cheap. But what makes me so angry is that though I never got my phone wet, the button was corroded by water.
How did this problem occur? I live in a warm and humid climate. I keep the phone in my pocket. In the gym, I took precautions (using a case and turning the open part of the case *away* from my body). But as many of you know, the Nexus 4 gets ridiculously hot, especially gaming (or when using GPU+gps+data at the same time). It was basically impossible not to sweat on this phone. And it broke as a result.
In short, LG and Google designed a phone that makes its users really hot, yet corrodes and fails if you keep it in a sweaty pocket.