I can now say that the problem is gone.
What I did was to push the Micro-USB port's tab upwards about half millimeter.
I identified the problem was related to the USB port by identifying "vbus-tuna_otg" kernel wakelock in Wakelock Detector".
Saw this comment:https://code.google.com/p/android/issues/detail?id=23789#c355
and decided to try. Worked like a charm! :)
EDIT: If the problem will return, i will buy a replacement part, as it is very to replace.