I have the same exact issue. During actual matches, my game runs beautifully. Before and after the match is when it goes all to ****. The multiplayer lobby lags terribly, locks up intermittently, and drops my game session about 70% of the time when I click join match. If I'm lucky enough to fight through the lag and locks and get in, I'm golden. That is until the score/awards screen after the match- the issues start up again.
Your GPUs may be unthrottled and reacting to extremely high FPS rates by becoming unstable and overheating. Some GPUs and drivers will do that in menus and other text-type screens.
If that is what is happening to you, try enabling vsync and retesting.
I've tried vsync - still have lags in menu and loading screens.
P.S. I've even tried Medium settings and Window mode but nothing really helps. The game is running smoothly if i MANAGE to join the map and start playing ☹️
Thats the thing about it. You'd think the game itself would lag if it was our computers. I even set the resolution to sub-720p and the scaling down and all settings to low. Still massive lag and freeze in the menu. Until about 2 mins into the game then boom, completely playable at 1080p no spikes or freezes or slowdown.
