Windows aggravation

My PC is networked via ethernet cable to a router shared with my wife's PC, which is the primary, and the router is connected to a DSL modem.
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=9&t=27396
It's a D-Link DI604. Will investigate 'static IP addresses'.I don't have time right now to give you full directions on how to do it, but have you tried setting the router up for assigning static IP addresses to your computers? Might help.
What kind of router is it?