Apparently the Auto Power Off Timer. If it ain't broke ....
Firmware Update version P030D8
10/02/13 800 KB epson15628.exe Download
Description: This file contains the Epson Stylus Pro 3880 Series Firmware Update version P030D8. This file extracts to your hard drive and is placed in a folder that begins with C:\epson\epson15628…
This update corrects possible issues with the Auto Power Off Timer.
Compatible Systems: Windows 10 32-bit, Windows 10 64-bit, Windows 8.1 32-bit, Windows 8.1 64-bit, Windows 8 32-bit, Windows 8 64-bit, Windows 7 32-bit, Windows 7 64-bit, Windows Vista 32-bit, Windows Vista 64-bit, Windows XP 32-bit, Windows XP 64-bit