I've had occasional random CTDs not associated with the "A" key or the stadimeter. They seemed to get better after 1.1 but I might have just had a lucky streak. This weekend I had a big crash in the middle of a really exciting action and I hadn't saved before it. The whole patrol was shot and Ubi nearly owed me for a new PC because I really wanted to toss it across the room.
I will say this for SH4; if I didn't like the parts that do work so much the other stuff wouldn't anger me nearly so much.