I have just installed manjaro on a PC with brand new motherboard (MSI B450 Mortar Max), Ethernet controller on it happened to be Realtek RTL8111/8168/8411. And now I have issues with it, at first it works, but sometimes it drops connection to the router and it cannot reconnect. I've looked on google, it appears driver for this device had some issues, most of the forum threads suggested to switch the driver to r8168 or r8169, I tried booth, r8168 and r8169 and booth seem to have this problem.
There's also this one strange thing I noticed, if I start downloading a game on Steam it drops the connection shortly after, unless I set bandwith limit. I have 100Mb/s connection, I have to limit it to 7MB/s in Steam settings to not get disconnected, if it's unlimited I can't even ping my router. I assume it's the problem with the driver or the motherboard hardware as everything worked fine on my previous motherboard.
If anyone has any ideas, please help.