I've had one black screen when a game has fully finished. Tbh, I haven't really experienced any issues in lag or performance. To me, its more ultra sweaty tryhards quick scoping out of nowhere that spoils it. We were wondering in a game of Domination last night whether 2 of the opposition were hacking.
Whilst a little annoying, we won the game as there weren't PTFO. Possibly the usual youtubers trying to find easy ways of getting video clips together. Dicks.