iOS 5 beta: Crash Experience

Hi,
today I experienced my first iOS crash. I was changing keyboard languages when the entire system crashed. The Apple logo came in.

Its not Jailbroken.

In iOS 4.3.3 it used to happen about 1-2 times a week. But as I restored from back up, I didn't gave much attention to it, since we all know that back up restores are not as stable as new setu up.

I also think its not hardware related, since it did not use to happen with frequency. Also, in 4.3.3 I had a lot more app's crashing. I am pretty shure its software related, but got worried last night, since it was my first iOS 5 system crash. Oh, and the iOS 5 was set up as new.

Has anyone of you experienced any kind of system crash in iOS 5 beta ?

Thank you very much in advance.