Respringing is the term for restarting the device's SpringBoard. The process takes about 10 seconds and, by default, returns you to the Lock Screen. Mobile Substrate does this to exit Safe Mode if the SpringBoard crashes.

Is Respringing bad for iPhone?

From sbsettings, it can't harm a thing. It just drains your battery a bit.

Why is iPhone Respringing?

Respringing is when the iPhone essentially goes through a soft reboot. It never fully shuts down, but the Home screen is reloading itself. ... The issue seems to stem from applications that use the local notification system and how that relates to the iPhone's date/time system.