What is the problem?
Load a GCODE file and start print. The GCODE viewer runs faster than the print, even with everything for printing set to 100% feed rate. it continually gets further ahead of the print. By the end of a 40 layer object, it finishes about 10 layers before the print. In addition, as the viewer is running, it will occasionally reverse itself, and "erase" what it shows was just done as if it was printing with an eraser, then stop and go forward again. This is doing it on not only newly sliced objects, but on GCODE files I had printed in the past without issues. It started suddenly without any changes made to octoprint or Firmware
What did you already try to solve it?
Updated Raspbian, Updated OctoPrint to the latest version, Started octoprint in safe mode, reinstalled raspbian and octoprint on a fresh microSD card.
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware,
serial.log or output on terminal tab, ...)
OctoPrint 1.3.10 on Raspbian Stretch Nov. 2018 release, Anet A8 with Marlin 1.1.9