I'm not having the same issues as you are CPL but I have this program called Memory Cleaner that frees up any, well, memory by trimming processes' working set and clears system cache at the click of a mouse. I've seen performance increases anywhere from 1-2 FPS to 15-20 FPS depending on the game and the length of time I've been gaming, and how badly the game itself leaks memory. At the very least if this doesn't help with the crashing it'll give you some extra frames in-between.
