This has been an issue from day one that I just keep forgetting to mention. When our 2Xs start, it lays down a line across the front of the build plate. This is fine, the problem is that the line is off center and goes off the build plate on the left hand side. It goes so far to the left that the carriage bumps into the frame and causes some skipping of the stepper motor. I like that it lays down the line before starting, but would turn it off if it stopped it from bumping the frame.
Next time this happens, could you follow this walkthrough: How to report a problem in 3DPrinterOS?