i get crashes as well. at work I'm running Yosemite on 2012 12 core Mac Pro, 64gb ram, GTX780 flashed. at home Yosemite as well and an 8 core mac pro (2009) 32gb ram, GTX Titan 12gig flashed. prior to that was a GTX780 and prior a GTX 680.
i get crashes also. not as frequent as the original poster but more often that id like to have happen. a couple of time got corrupted session files that became un-openable. luckily the save backup vault worked. old FCP7 used to be solid as a rock. can't say the same for PP CC. still i like PP as its a strong performer with my chunky GPU's.
i don't consider Adobe products very reliable. must backup frequently to play it safe.
david