[ EDIT - Phidy got it spot-on! I switched over to 442.74, and Warframe and the other two games suffering from this problem are stable! If anyone else is having this problem, I'd recommend joining me in raising it to Nvidia support so they can get this fixed ASAP! ] Also bumping for visibility, since this problem has been driving me insane too. I'm just waiting for the 442.74 drivers to install, as per Phidy's recommendation. I'll check back once I get to test this.