Charge your device to 100% , then wipe cache, Dalvik cache using TWRP.
Worked for me.
done and checking...
---------- Post added at 09:55 AM ---------- Previous post was at 09:54 AM ----------
Regarding the sdcard unmounts, I flashed RedKernel-r022-AOSP.zip and now seems OK. No unmounts at all for 18 hours or so.
redkernel gave me sdcard unmounts...