I had a problem on my iPad Air 2 (iOS 10.1.1) where searching in the settings app wouldn't find any installed apps or "Podcasts" or "iBooks". Built in settings could be searched for, but not anything else. I did a back up, erase and backup restore of my iPad which fixed the problem for a few days, but now it's back. Stranger is that the problem is now also affecting my iPhone 7 Plus (also iOS 10.1.1), which wasn't previously having the problem. Both had the problem happen the same day. I don't want to do another restore to fix this, since apparently that's a temporary fix. Anyone else seeing this problem?