Happened twice so far Once while shooting at some TR mid fireing and again after rebooting the game at the sanctuary I had just switched from light assault to infiltrator and I believe it happened just as the count down for instant action reached zero. Windows doesn't say anything about it happening either. I'm just suddenly back on my desktop with no warning.
I have the same problem. Game crashes ~20-30min without any error message. The game stopps. I hear sound. Maybe a blackscrren. And then i get into windows. Edit: Had another crash. What happens: I want to redeploy. Click on the Spawnpoint. The game turnes black. I can only move the mouse. 1-2 seconds later. I get thrown into windows. No gameerror message or whatever.
Had two crashes to desktop within the first 20 mins of play. Once while flying around, the other just after I died and before it went to the death screen. Can say in my case it wasn't the instant action timer, as I hadn't used it. The first time it froze for a good few seconds before the crash. The second time it was instant.