So, I did turned off my iPhone (using the lock button + Home button) like I typically do every now & again. Upon restart, I had to enter my passcode as usual (since you can't use TouchID after you restart your device). However, after that, TouchID wasn't working. Then, I went into Settings and saw that all my saved Fingerprints were gone and the options to Unlock iPhone with TouchID was switched off. Has anyone else had this happen?