Nobody except me can enter caves when I host.

Hey Klei and fellow forum users.

I'm running a high-end pc with 250/100 mb/s. For the last months, ever since caves were added. Whenever someone enters a cave, shortly after they disconnect. I'm running an Ethernet cable straight into the wall, so there are no mysterious router settings afaik. Regardless, I'd love some help on this so that me and my friends can experience the full game together, thanks.