If you haven't already, use the DHCP settings in the Advanced menu to set that computer to have a static IP address (via DHCP). That way, the IP won't change when the DHCP lease expires. It probably won't anyway, but this will make sure it doesn't. (It's a good idea for printers, too.)
[Be nice! We are mostly fellow Verizon customers. My setup: 75/75 Mbps; Linux router (2x 1Gbps ports) + iptables; Netgear Orbi x 2
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