"Soft" reboot / 3G fails to load / spontaneous reboots on SGS2

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http://androidforums.com – Using SGS2, unlocked, 2.3.6 rooted, stock ROM. Yesterday I installed an app that upon first-time run, crashed the phone. However, it did not cause a complete restart, but rather restarted to the part right after you enter the SIM PIN. So it was a restart that did not go to the phone logo, or did not require me entering the SIM PIN but the whole home screen had to be re-drawn and superuser was alerting me of apps being granted superuser access, as in with a normal reboot. I'm not sure what the call this reboot (does anyone)...but is there an app that can replicate it? Because once it did (General)