Help My unsleep button is unresponsive.

[jeff000]

The button on the top of my nexus to get the screen to turn on so I can unlock it has become increasingly unresponsive. But not all the time, a small part of the time it will act normal and be fast. But most of the time I press it and it needs 10 seconds before the screen will come up.

How do I fix this? I am pretty sure I am on an old version of android too, I have a dev version of then nexus, I thought I was supposed to get the latest vanilla version ota or something?

TIA