If you are not sure what model printer you have, you can send an email to Flashforge with your printer's serial number and they can tell you. The email address for Flashforge support is: sup...@flashforge.com.
After a lot of effort and with help of someone on Facebook flashforge group I managed to find out the problem. (At least in my case). Always i have checked the Verbose G-code and Label object in output file section. I don't know if is same for you but you can try to uncheck and export gcode without comments. That's work's for me. I can send you the config file if you wish. As well i have nervous about Z travel speed because is to high value ( is the same as xy travel speed) but I take the risk and I tried Hopefully works( maybe firmware take care for max travel speed.)
To test dimensional accuracy and print consistency, we printed a 20mm calibration cube 20 times to see if there are any differences between the different cubes. We noted that our cube measured 20.3mm (l) x 20.3mm (w), which makes the Flashforge Finder slightly below average for dimensional accuracy. We also noticed that between the first and twentieth calibration cube, there were slight differences in the surface finish of the flat walls of the cube. This indicates that the extruder on the Flashforge finder is inconsistent.
Find Replacement Parts
As the Flashforge finder uses several proprietary parts, replacement parts and components are not easy to come by, and users need to contact Flashforge directly to service their printers.