Monoprice Maker Select Plus 3D Printer not reading Gcode

I bought a Monoprice Maker Select Plus 3D printer.
It worked fine right out of the box and I have been printing models for the past 3 weeks. It finished the last print completely. Unfortunately now when I insert an SD card and choose print I get 4 empty rectangular boxes showing on the screen. No files are visible.

I don’t have the answer but I recommend joining the users group on FB as well.