Mouse camera movement locked / frozen in-game (cursor works in menus)

During a match, my mouse camera movement completely locked up and wouldn't respond to any input. Prior to queuing up, I was in the lobby setting up my NVIDIA GeForce Overlay (Alt+Z) and briefly Alt-Tabbed out to share a video clip with a friend on Discord. After tabbing back in, I queued into a match, picked Alter, and as soon as we were in the dropship and skydiving, my camera was stuck pointing straight down. Weirdly enough, the mouse cursor worked completely fine whenever I opened the inventory, map, or settings menus, but zero camera movement registered in actual gameplay. Later in the match, after getting knocked and revived, the camera just snapped to a slightly different angle but remained completely frozen, leaving me unable to aim or look around at all.