Try this first1. Fully power cycle the printer - remove the power cable and leave the printer unpowered for 20 seconds, then restore power.
2. Buffer overflow errors are a USB data issue which can be permanently fixed by networking the IP series printer. How to Network Your IP Printer Additional TroubleshootingI. Make sure the software is sending the correct sensor type information (Gap, Notched or Continuous) via Label Part or Print Driver. For example Label Part THT-148-422 is currently set to Notched in Brady Workstation but the material needs to be calibrated off the gap, causing the error and no print. To resolve this issue in Brady Workstation:
1. Open Brady Workstation's Label Settings app.
2. Select: Create Custom Label then Add new custom label from Existing Label.
3. Type THT-148-422 into the Label Name field and press Enter.
4. Click on the THT-148-422 that appears in the bottom half and then click Create button in bottom right.
5. Enter a Label Name at the top that you will know means these labels.
6. Change Sensor Type to Notch and click Save button in top left. Be sure to select this custom label when creating label files to be printed on these labels.
If using CodeSoft, make sure to configure the printer to use the internal CodeSoft driver: CodeSoft - Configuring Internal Printer DriversII. Make sure the installed ribbon is compatible with your materials:
III. Make sure the ribbon is installed correctly.
IV. If you receive the "invalid label tag" error then the RFID chip on the labels may be corrupt. Confirm this by loading a roll of labels with a different part and lot number. Contact Brady Technical Support if you have a custom part with corrupt or incorrectly programmed RFID tags.
V. If these issues occur across multiple label and ribbons of different part numbers then mechanical failure may have occurred - check the label media holder for damaged or broken pins. 
