Network name keeps changing with Print Share

I have 3 iMacs on a network using a Brother MFC-9840CDW printer. My computer is set for print sharing. I keep getting messages that the name of my computer is already in use on this network and it keeps adding a higher number at the end of the name. But as soon as it does that, the other computer cannot print until I change my computer name back to the previous number. It works for a while, and then I get the network name error message again.
What can I do to resolve this? Thanks.

New MB user. have windows network. installed printer CUPS driver for my brother 7820N printer. can print when connected directly with USB. MB recognizes printer when not connected directly...must be going through the wireless network. try to print and little printer icon on DOCK starts jumping...says printer is Off-Line. can see the files in the queue.
Any ideas on how to make the printer "on-line"? Thank you.

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