I had a lot of trouble with programs crashing right before I sent my laptop off to be replaced. Safari was the worst. I tried to reset Safari, but it did not help. Microsoft Messenger would hang when shutting down all the time. iTunes would crash regularly. This was right after I sent it in to be replaced, and the OS had only been installed for a few weeks, so I'm leaning toward another hardware fault because nothing should have killed OSX in just a few weeks.
I got the replacement for many reasons though, not just because of program crashes. My trackpad would go out all the time. Last weekend it went out for thirty minutes, and a restart, SMC reset, and NVRAM reset would not fix it, and this was right after getting the machine back for the second time for this to happen. Also, in the last repair, my iSight was replaced, and my fans. In September my hard drive died, and my logic board. At this time my trackpad was also having a lot of issues. So last week I decided to call Apple and they are getting it replaced.