PoE2 Disconnects Entire Home Network When Entering Instances

When playing Path of Exile 2, the game causes my entire home internet connection to drop, affecting all devices on the network (phones, laptops, etc.)—not just the PC running the game. This usually happens when I log into the game, portal to my hideout, or teleport to someone else’s hideout. The issue seems to occur specifically when connecting to a new instance. The only workaround I’ve found is playing with a VPN turned on, which prevents the disconnect but causes significant lag and slow performance.