I have had my nexus 5 for roughly a year now and still have some left on my tab. Just recently my phone has been acting up; it is shutting off by itself and when I go to turn it on it begins to turn on then shuts off again. I googled this issue and it seems the nexus 5 is known for power button issues causing this exact problem. Am I still eligible to get this fixed, and if so what do I need? I cannot find the receipt for when I purchased it but like I said, I still have a tab remaining from it.