Why is my iPhone restarting after 3 minutes?

Hello, I have an iPhone 11 Pro Max and it keeps restarting after 3 minutes, and also when the phone is on I can't make any sound, not even from the ear speaker, so I can't watch videos, it just pauses by itself and doesn't I can raise or lower the volume. In the panic log it only shows that the Prs0 sensor is missing, but I just changed the charging port so I don't know what could be causing it. I firmly believe it has something to do with the speaker, but I'm not sure. I'm not a specialist. Can you help me? Thank you.