Do you know if the printer has a static IP address assigned?
Instead of requesting a new IP address from the router each time the printer is turned on, it has a permanent (statci) IP address within your network.
The printer's User Guide/Manual should explain how to do that but you also need to corrodinate with the router's settings. For example, you must set the printer's static IP outside of the address range of assignable (DHCP) addresses available for the router to use.
What router are you using? You may be able to improve the connectivity via the wireless settings as well.