I did a quick search of our JIRA and didn't see any known issues with the RSA SecurID Software Token 2.4.2 for iOS crashing. If you are having an issue with the token app, I'd recommend that you contact RSA Customer Support and open a case.
I get this issue when I am multitasking on iPhone. I open the RSA app works fine. I then multitask to another app open another app, multitask back to the RSA app and the app crashes everytime. Anyone else experiencing this?