Missing label when print directly from application form often)

I'm developer. I develop an application windows service to print label from my template(pdf file) through printer name method(TCP/IP).
I am using Zebra Zt410 printer with version V75.20.14z.
I will set given quantity then printer automatic print with exactly quantity but sometime, we miss one or more label.
I check log in queue printer spooler. It still match quantity with given quantity but Zebra printer still miss label.
I don't know why missing label in printer and please let me know how to prevent it happen again!

Thank you so much.

DEVTALK l Learn About the New Features of Printer Profile Manager Enterprise (PPME) l Oct. 2019

Learn about the features introduced in Printer Profile Manager Enterprise (PPME) including automated wireless cert management and ZC card printer support.

Presented by: Chris Kenley,  Software Engineering, Zebra Technologies

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Zebra ZD420 ZPL -> ZBI webservice

Hello All,

We are working on Zebra ZD420. I have a task to call a web-service and capturing the output in ZBI.
According to Zebra Dev Talk ( 15:18) it is possible through triggering web alert.

I found no information how to implement that especially capturing the response.

thanks in advance

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If you have any ideas???
Thanks in advance for your help !

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