Played around 4-5 hours yesterday had no problems (14 May 2015).
Played around 3-4 hours today (15 May 2015) and had a CTD for no apparent reason. If I remember correctly the crash happened during the end turn phase.
Restarted and played for about another hour and had a crash at the same spot (during end turn phase).
Waited a little and then restarted. Played for about 30 - 45 minutes and had the crash again.
I rebooted and started to play again. Played for 30 minutes and then it crashed. This time it happened when the game was asking me for input during the end turn phase. I made my choice then the game started thinking then crashed. The other crashes may have happened at the same time as this last one, but I don't remember.
System Specs: AMD FX 9370
nVidia GTX 980
32 gig of ram
Intel 128 gig SSD