After being idle for more than 10 minutes, my iMac simply refuses to activate the scanner, even though it is connected and the computer & the router know it is there and can see it! 'Re-setting the printing system' doesn't help; I have to switch the scanner on and off. This is silly. If I try to scan using the buttons on the printer, it is the same – the printer reports an error also. It as if the computer and the scanner are blaming each other.
iMac late 2015, OS 10.15.1, Epson XP-760 (software latest)