Lighting flickering in build mode

10kiiwii01​  I've merged your post with another thread about this issue.  It's in PC tech for now, but that doesn't mean it's confirmed not to be a bug; it's just best to have everything about one problem in the same thread.

Anyway, please provide a dxdiag.  Click Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop.  From there, you can attach it to a reply using the paper clip (Attachment) icon included with the other formatting buttons.