The blade is not lifting during the cutting process between line segments and so creates a continuous cut line OR the blade is not lowering during the cutting process either immediately (when it is supposed to drop down) or doesn't drop down at all during the cutting process.
This error may be caused by the following reasons:
Begin by ensuring that the original USB cord is in use. If there is not a direct connection, change the connection of the cord from the USB hub (or other indirect connection) and connect it directly to the computer's tower USB port or laptop USB port.
Once the above has been confirmed, check for the presence of any blue packing tape remaining on the blade carriage. If any such is present, remove it as such can cause concerns with the blade mechanism working properly.
If all above points have been checked, perform the following steps: