Printing multiple copies of a label results in an error

[saschaludwig]

This error occurs, whenever I try printing multiple (for example 10) copies of a label.
Only 5 labels get printed. Then the error occurs:

Traceback (most recent call last):

File "/home/inventree/src/backend/InvenTree/plugin/base/label/label.py", line 36, in print_label
plugin.print_label(**kwargs)

File "/usr/local/lib/python3.11/site-packages/inventree_brother/brother_plugin.py", line 232, in print_label
send(

File "/usr/local/lib/python3.11/site-packages/brother_ql/backends/helpers.py", line 57, in send
printer = BrotherQLBackend(printer_identifier)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "/usr/local/lib/python3.11/site-packages/brother_ql/backends/network.py", line 50, in __init__
self.s.connect((host, port))

ConnectionRefusedError: [Errno 111] Connection refused

I'm using a QL-720NW, connected via LAN.
It looks like the printer won't accept connections while it is still printing, or some other race condition.
After the error occurs, I can print normally.