Hello my name is***** do not rate until we are finished. I look forward to assisting and am very sorry to hear that you are having this problem.
The software detection can not be relied on that is why drums print a line in the same spot every time to note they need to be replaced.
Otherwise people would constantly try to reset the counter even though it can damage the machine. From everything you have told me the drum needs to be replaced.
It can cause everything you are describing and the only other part that could cause the light prints would be the fuser if it was not heating properly.
If you have any questions at all reply and let me know. If not please don’t forget to leave a positive rating by clicking the stars/smileys for my help - it is greatly appreciated. Please note you are rating me only not this site or your Brother.