Do not use third-party "driver updater" software. They will install malware or incorrect drivers for the H81 chipset.
For advanced users, the open-source tool Snappy Driver Installer Origin (SDIO) is excellent for the H81M-CS. It can detect the exact revision of the RTL8111G and ALC887 that ASUS customized. asus h81m-cs drivers
Select your (Windows 10, 8.1, 8, or 7) from the dropdown menu. Do not use third-party "driver updater" software
The Intel Management Engine Interface (MEI) driver is critical. Without it, the board cannot properly communicate with the CPU’s power management features or the PCIe controller. Symptoms of a missing MEI driver include random shutdowns, inability to sleep, and USB dropouts. inability to sleep