I fixed this! I went into my router's advanced settings and turned on port-triggering (not forwarding). See screens:
Actually, i have not had this problem recently. I did buy a new WiFi Router 6 months ago and did not have to do this setup on it. So I don't know if Apex fixed it, or if it was a symptom of my old router. I suggest trying to upgrade your router to the latest firmware, update your network card drivers, or i hate to say it, but replace your router. Also, make sure you have enough internet bandwidth. Sorry I cannot be more help. All I can say is that I don't have this problem anymore.
FWIW - I also have an Asus GT-AX11000 like the response above. I did not have to do port-forwarding though. Old router was a netgear nighthawk r8500 that eventually slowed to a crawl.
