Please Help! Flickering Issue In UE4

Anybody can help me? Facing an issue with weird flickering on my object. And also lighting seems to change when the camera pan even with auto-exposure off. Please see the video in the link below.

https://drive.google.com/drive/folders/1DvaoxKRL7JFU0d8uOk3Nl_Jxes3szqUS?usp=sharing