My Brother color laser keep dropping from the wi-fi after 5 minutes for no good reason
I found this solution and it worked for me – hope it helps someone else
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Xomino 
Not sure if you have a UniFi network – if you do and you have activated “Auto-Optimize Network” I had exactly this error. Deactivate it and your printer is up and running again!
I don’t – but thanks for leaving the comment – hopefully it will help someone else 🙂