I bought a zl and was unaware of all the problems with kit kat. So my phone kept random restarting and draining my battery. So I have found something that has fixed my phone. Go into your settings, power management, then turn everything off. the stamina mode, low battery mode, and queue background data. You can leave the wifi on. After I did this my phone has not restarted and my battery has improved alot. I hope this helps.
kevin
