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It really isn't normal, but it's probably not very serious either. Around menopause, hormones can fluctuate, and the lining of the uterus may build up and slough off only seldom. Since it's been as long as 4 years though, you do need to see your gynecologist, since any bleeding after menopause is considered abnormal.
Endometrial hyperplasia (the overgrowth of endometrial [uterine lining] tissue in the presence of estrogen but without progesterone typically occurs after menopause. Your gyn may do an endometrial biopsy just to make sure there aren't any atypical cells. It's typically treated with progestin to make sure all the lining sheds. Worse cases can be treated with endometrial ablation or D & C.
Please let me know if you have questions.