What causes a iPhone 4 springboard to keep crashing?

My iPhone 4 is jailbroken because I'm on straight talk and have to have Internet! Anywho, a few days ago my springboard crashed during a phone call, just now it crashed again when I was on a phone call. What causes springboard to crash? Is it because I have to many apps running or something?

If you have hacked your system to get extra perks that will do it

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