EFI Shell version 2.31 [1.0] Current running mode 1.1.2 map: Cannot find required map name.

[AC Question]

Complete screen display is "EFI Shell version 2.31 [1.0] Current running mode 1.1.2 map: Cannot find required map name. Press ESC in 1 seconds to skip startup.nsh, any other key to continue. Shell> _" and just today (2/17/2016) the above popped up on my screen, about one second after "Lenovo" showed after I started my Lenovo TAB S8-50. I do not have a keyboard for the tablet - never needed to use one. So, can anyone tell me how to fix this tablet? Thanks in advance, just call me frustrated.