Game freezes and will only unfreeze if its Windowed, or alt-tabbed

I just built this PC about two months ago, and its been performing perfectly fine until now. I opened the game up today, and it would work fine for 2-3 seconds before completely freezing.

 I found out that when I pressed my Windows key and sort of "alt-tabbed" the game (by having it in the background of that little Window's menu), that it would unfreeze and work smoothly. Going to tab back in would cause it to freeze again, though, so I would try to fiddle with settings by pressing my Window's key and then quickly clicking on stuff in that 2-3 second time-frame before the next freeze. I was able to get into a Firing Range match that way, and I got a bunch of the lag symbols on the side; latency, congestion, and prediction error. 

Tried searching online for similar issues, and skimmed the forums for anyone else having these problems recently to no avail. 

Already reset my modem/router. Switching to DNS and trying an address that an EA forum employee recommended to another user a few years ago didn't work. There aren't any driver updates recommended for my device. I don't know what else I can try doing because again, this is a very new PC and my first one too, so I am very lost. Thank you in advance...