Laserwriter problem: the network host is busy ...

HI,
My Intel iMac is connected to a LaserWriter 16/600 PS.  I have used this printer for many years.  I have always worked even with my Intel iMac.  This morning trying to use it as usual I got a print error message, telling me: "reversible problem: the network host «10.0.1.4» is busy (see below)":
I restarted my iMac and my printer in this order, and still got the same message.   No changes has been made to my network.  What could be the problem ?
Regards.
Robert Lespérance

Hi,
The «Host is down» message is back again ...  For a reason I don't understand, I am unable to print to my LaserWriter 16/600 PS anymore. 
I have been using this printer in the present environnement for 2 years without any problem.  For a month or so, my iMac seems to loose contact with the printer.  Playing around with the cables and restarting the computer as done until now, but I don't understand what really gets my back in communication with the printer.
This morning I have tried to be more cautious of my steps to see what can be the way back, but I was not able yet to reconnect to the printer.
I closed the printer, disconnected the cable to the router, restarted the computer and opened the printer ...  Nothing did it.  
Who or what is the intruder messing the communication ?

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