(Help!) Battery Drain Problem in Rooted 7840 Lollipop

Hey guys am new to this forum even though I have been using your advice for some years now This time I finally encounter my self in really really big trouble with my brand new dell venue 7840 , what happens is that i got the freaking updated for lollipop out of the box, next to that i followed all steps to root lollipop it took some time but everything went 'right'. But 3 days later my tab started to drastically drain Battery, to the point were i cant actually see it going from 100% to 0% in just a minute or two, i hope making some kind of a downgrade to 4.4.4 could fix this issue , but im afraid that when I try to get in to tethered cmw it just show this :
================================================== =====================

DEVICE STATUS: FASTBOOT-ONLINE

DEVICE INFORMATION: 56900EFA01 fastboot

================================================== =====================

copy needed files to our device
target reported max download size of 536870912 bytes
sending '/tmp/recovery.zip' (3477 KB)...
OKAY [ 0.384s]
writing '/tmp/recovery.zip'...
FAILED (remote: Bootloader must not be locked)
finished. total time: 0.655s
target reported max download size of 536870912 bytes
sending '/tmp/recovery.launcher' (400 KB)...
OKAY [ 0.276s]
writing '/tmp/recovery.launcher'...
FAILED (remote: Bootloader must not be locked)
finished. total time: 0.545s
we need to stop logcat before replacing it
...
FAILED (remote: command not allowed in this device state)
finished. total time: 0.376s
target reported max download size of 536870912 bytes
sending '/system/bin/logcat' (178 KB)...
OKAY [ 0.269s]
writing '/system/bin/logcat'...
FAILED (remote: Bootloader must not be locked)
finished. total time: 0.537s

issue fastboot oem "stop_partitioning" command to start cwm recovery:
...
FAILED (remote: command not allowed in this device state)
finished. total time: 0.367s


even though the bootloader is not locked , and if i try to unlocked it again in order to enter cmw it says this:

.................................................. .................................................. .................................................. .................................................. .................................................. .............................
C:\Users\Hugo Sanchez\Desktop\IntelAndroid-FBRL-05-16-2015-PTR\resources\platfor
m-tools_aosp>fastboot devices
56900EFA01 fastboot

C:\Users\Hugo Sanchez\Desktop\IntelAndroid-FBRL-05-16-2015-PTR\resources\platfor
m-tools_aosp>fastboot oem unlock
...
(bootloader) Checking unlock authorization.
FAILED (remote: couldn't change state)
finished. total time: 0.309s

I hope some one can help me to fix this

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