[Xperia Z Q&A, Help & Troubleshooting] Jorge Plascencia:
Hey Xda'ers, I have this weird (and really frustrating :confused:) problem with my Xperia Z, when it enters Deep Sleep mode, sometimes it won't come back (won't turn on the screen & wake up.) I keep tapping the status bar (got CM11 Nightly & tap to wake option enabled) and hitting the power button to wake up, but it never does, then it just reboots.

The only workaround i've found it's to implement a partial wakelock so the cpu keeps running even if the screen is off, but thats eating my battery away. I Bought the phone a month ago and since its arrive, has this problem, i know it's a software problem cause if it wasn't, then there would be no workaround like the cpu kept running all the time (or at least my noob brain figures that out :( ). it's been really frustrating. the most frustrating part is not finding ANYWHERE on the internet (not even here on XDA) any resemblance to the same problem im facing, they are all different kinds of rebooting problems, but not even one the same as mine, it means my problem it's really new or special, or i'm not looking up really well, anyways it's been so frustrating for me this month, cause i repeat, since it arrived it has this problem.

First i thought it was a Wifi Problem, cause it happens when i get a notification meanwhile is asleep (i've seen it happen more often but it happens with or without a notification too.) and the screen off; When i try to wake up to see the notification, the problem triggers and it wont wake up, so i installed "Advanced Wifi Lock" (I saw a thread with a similar problem but with an Xperia Pad of some girl on the Sony Mobile Forums, and one guy posted this solution as the only workaround he had found to the same problem.) and the problem was solved.

But then i realized that it was eating my battery, so i changed to "Wakelock Power Manager" (cause i read it was a lighter weigh solution than "Advanced WiFi Lock") and there, there is this option for the implementation of various degrees of wake lock, since i thought it was a wifi problem, i turned on the "WiFI_Mode_Hi_Perf" which is a wakelock that keeps the wifi running in a high performance mode even while in deep sleep, i thought this was a lighter solution to my problem, but then the deep sleep reboot problem started again :crying:. so i tried increasing the level of wakelock to a "Partial_Wake_Lock" which is a wakelock that keeps the CPU running even while the screen is off, but this wakelock won't let the phone enter in a deepsleep mode, so it's the "Advanced Wifi Lock" problem all over again. Battery Drain :(. And this pisses me off, cause my battery, that should have a more than 14 life hours, just have those with a 4-5 hours of screen on time with a mild use of whatsapp and facebook.

I don't know what to do, i've tried flashing other Stock Firmwares, 4.1, 4.2, 4.3, 4.4, reflashing the original (was a 4.1 "10.1.1.a.1.307 customized hk"),, rooting and flashing roms, and the problem persists. I left CM11 on cause i like it and i don't think it has anything to do with the rom or firmware cause i've tried so many already.

Finally, over a month of trials and reading and so, so, so, but SO much frustration, i come to you guys, i don't know what to do anymore, Please Help :(.