1. What printer?
EPSON 890
2. What kind of connection?
USB
3. Have its drivers been updated?
I think so..
4. Have you tried deleting it from System Prefs->Printers and then reinstalling it?
not yet..
At start up it's off line...have to restart to get it on line...
As long as you don't have to do that daily... 
It could indicate a pending USB port or card failure. Maybe a USB cable with some failing wires.
Does the computer run 24/7 or does it shutdown/restart daily?
"There's a dark cloud inside every silver lining!"
I can change the cable , is there a special one to buy ...?
Thanks
Any USB printer cable will do. Like this: https://www.amazon.fr/Transfert-Données-Imp...eywords=printer
I have no idea if you have "dollar" stores over there - but if you do, you should be able to get one there. No need for anything special - the high priced ones are usually a complete rip-off, as are many of the big "brand" names.