same problem happened with me..My Samsung S7 edge was used to being over Heated, Restarted oftenly, Hanged..So I was irrited and went to Samsung Care for the above issue...they returned me my Android after 1 week by replacing internal battery and didn't tell me about the problems...I was shocked!..Within 1 year my Android's battery has been replaced...😢..This time it's fine because my Android is in Warranty period but what if my Android's battery will have the been damaged after the warranty period..? Frankly speaking either my Android's battery or they have given me faulty product...
