[UNET] Clients lose connection to server, how to fix?

Hey, I have created an online game using UNET. When I use LAN everything works perfectly fine. No clients lose connection to the server. However when I am using the match maker, clients lose connection to the server after a little while. (Like 2-3 mins depending on how many clients are connected.). I also get these errors: (Screenshot - a576313768c84af37495cd7956e885b6 - Gyazo “errors”). I get absolutely no errors except these while running the game.

change QoS channel #1 in NetworkManager to Reliable Fragmented