I had this problem too but only with the one game I play. I think it may be a file permission conflict between the app & the priority of the phone call settings. If you have ROM Toolbox you can fix permission issues of one app. This worked for my Facebook app.
Rom Manager just fixes permissions of all the apps at once and that may make matters worse. Try keeping track of what app/s are doing this. If a great many are force closing, ask your self...is the Superuser binary up to date? Is the app up to date? If the app hasn't updated in a while, try Superuser update fixer. It works too. If only one app keeps doing it...then you might have to uninstall it. It may not be compatible. I had to do that with Facebook. I just ran it thru my browser till Zuckerburg & Co. fixed the app. Good luck.