Unable To Open Bigfile Bigfile000 Exclusive //top\\

Do not skip this. A reboot clears file handles left behind by crashed processes.

If the operating system hits a physical block error on your storage drive while attempting to pull the exclusive lock handle, it will drop the connection entirely, prompting the crash. Run a low-level volume check: Open as an Administrator. unable to open bigfile bigfile000 exclusive

Are there any accompanying in your alert log? Do not skip this