I've got the latest cgminer (2.9.6) and in many different machines with different cards it crashes randomly every 24-48 h or so... so there is a problem there. This never happened with the good old 2.4.x ones..
I am using cgminer 2.10.1 and am having exactly the same problem, only mine crashes after about 2 hours an I have to re-start it. I never had this problem before when using the Phoenix miner, which was rock solid, but when the two pools I use encouraged miners to switch to the stratum protocol, it only made sense to change miners, but I am very frustrated with cgminer due to this instability.