Check your website files for any files that were not created by you...

While performing routine offsite backup, I stumbled upon an unexpected 10GB page file on a non-boot NVMe drive. Intrigued, I navigated to Menu/System/Advanced where I confirmed its existence and usage. After promptly deleting it, rebooting the system, and verifying its removal - everything seemed back to normal.

Although uncertain of the cause or timing (apologies for not taking a screenshot), it might be wise to investigate your system's Advanced settings for any similar surprises.

A quick note: Considering I possess 32GB of high-speed OC memory, a 1GB page file may be insufficient for most users.