Hi, First of all I'm sorry for my grammer mistakes. I have a Nexus 4 and my phone was working normally before update android 5.0 and 5.0.1. After I updated the phone, my battery performance has reduced nearly a half of before. I was charging it every other day but now I have to charge it everyday. And when my battery charge falls below of 30%, the phone is frequendly lose it connection with cellular network and ask me the pin code. I reset the phone, changed the sim card and even changed the cellular network provider, but no one solve my problem. I even tried to go back to 4.4.4 but I didn't find any way. Thanks in advance for all the help.