Glittering meshes and noise everywhere

Hi. Please could someone help me about two display issue?
I made a roof textured with a wood texture but when I export into UE5 it displays glittering. It seems to be burning. Another display issue is a noise witch displays everywhere.
I show two screens for a better description.

https://postimg.cc/D8KfJxtX
https://postimg.cc/4YfJwm44

Thank you for any answer