Probleme with printer

My version is OpenWrt 18.06.1 After install p910nd printer server, it is working fine with Epson l382 otherwise the service will not work if one of a printer reboot / sleep or i reboot the router.
I try many times follow step from internet also not work, please help let me know how to do it. How to make the hotplug feature under control!
Thanks a lot!

What router are you using?
Have you tried openwrt 18.06.8 or LEDE 17.01.6 ?

fwiw, I use p910nd with an old USB1 laser printing on HH5a (xrx200 MIPS device with USB2 socket) with LEDE 17.01.6. No printing issues when I reboot the router or printer.

It's possible there is a USB compatibility issue and you may never be able to solve it.