My ps5 shutting down randomly in the game.(Play Station 5)

Hello, my PS5 randomly turns off in the middle of a game, it may turn off after 10 minutes or it may turn off after 8 hours. And to turn it on, I have to unplug the device and then plug it back in. The power supply broke once before and I replaced it. It didn't work for a while, but then I encountered this problem. Even the USB port on the front of the device stopped working, which the repairman said was okay, but in short, it turns off in the middle of a game. I did everything you can think of, I cleaned the device board and the device fan as well, I bought a separate cooling fan for it, but it didn't work. Please help me and tell me where the problem is.