When I installed the 4.4 over 4.2.2 without flashing it, I then ran into problems like FCs to the point where I could not even get past the screen lock. When I rebooted into recovery it would stay on for a little less than a minute, and while I was trying to restore stock, the recovery would come to a halt and reboot my system. I then had to restore my system.
Today I tried putting 4.4.2 on it and it got through but it had a feature missing from it that I was looking forward to and I tried going back to stock once again and the exact same thing happens. Interrupted restoration to a reboot of nothing.