Router occasionally losing internet connection: Destination Net Unreachable

Earlier this year when I moved into a new apartment, I bought a Wavlink AC2100 Gigabit Router. From time to time, I would get disconnected from an online game that I play. Didn't think much of it, as you're always gonna get a little lag now and then. Eventually I realized that it was more than just occasional; it happened on a more-or-less daily basis and it was never accompanied by lag or any disruption to other online activity. I started leaving a ping window running in the background so I could see if anything was going on as my connection dropped. And it was not from timeouts but a single

Question by Hiten Style on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.