There is a good reason why most people soon after eating, store their chicken in refrigerator and then eat it cold the same day.
Once it is cooked and then cooled and reheated, the high level of protein in chicken changes. Like rice and mushrooms, consuming reheated chicken, especially if it is reheated to the highest temperature, can cause food poisoning.
After you reheat it once, you should not reheat it a second time again. Chicken can be safely reheated, just do not use the microwave, but put it in the oven or a toaster oven to heat it slowly but thoroughly. It does take more time than just simply put it in the microwave for a few minutes, but reheating it slowly will keep you healthy and safe.