Skipping labels or continuously feeding

Reason①: Changing your label type and size are the main causes for printer skipping labels or continuously feeding
First step：
Disconnect the USB from your printer. Check the segment of the video " MUNBYN Introduction Of Feed Button Mode".
https://www.youtube.com/watch?v=xo0zl6VAWM4&list=PLWHuumZXv30MSGeuvWQJxNLmwi-e7HERV&index=4
Let the printer re-learn your label. Then change your label type, size on your computer, then re-connect the USB to the printer.
Second step：
For Mac:

Select or input label width and height that matches label size installed in printer in prompt window.

For Win:

Go to "Control panel" -> "Devices and Printers"

(Right click on "This PC", choose "Properties", then click on "Control panel"-> "Devices and Printers")
-> Right click on Label Printer" -> choose "Printer Preferences" -> go to "Page Setup"

-> You can choose the size you need in "Paper Name".

-> If there is no label size you need; you can click "New" to create a label size.

-> Change Paper name and input width and height, click "OK"

Notice: The application you are using (i.e. Adobe Reader) could be over-riding your driver label setting and sending the print in a larger/smaller size to printer. Look for "Page Setup" or "Paper Size" in the print prompt and ensure it is set to the size you want.
Reason②: The sensor which detects the paper, is covered by dust and that causes the detection is incorrect
You can check this video to know: How to clear the Printhead

Turn off printer. Open the Cover and use the alcohol pads to clean the sensor. (Any 70% Alcohol pad would work.) Let 2-3minutes for components to dry, then close the Cover and turn Label Printer back on.