Why is Switchy crashing my jailbroken iPhone 5 into Safe Mode?

When a specific tweak like Switchy causes your jailbroken iPhone to enter Safe Mode, it is usually because of a conflict with another tweak or an incompatibility with your current iOS version. The first step is to open Cydia and uninstall Switchy to confirm that it is the cause. If you want to keep the app, try removing other recently installed multitasking tweaks that might be interfering. You can also try reinstalling Cydia Substrate through Cydia to ensure everything is functioning correctly. A full restore and re-jailbreak should only be considered if these steps do not work.