Avis Overheating and black screen

Everything was going just perfect, I fact too perfect, the display was amazing, the response was ideal and the interface was great. though there were issues with how long it took to get fully charged but I got used to that. I would have given it 5 stars without a second thought but yesterday, my phone ( Samsung M30) began to overheat and then the screen just went dark. I thought it was just a glitch buy 8 hours after my phone is still off and still overheating