Question [Q] Gesture sensor does not work

Hi

I have rooted my Samsung Galaxy S4 few days back and everything seems to be fine with more control but today I had discovered that my Gesture sensor is not working. I cannot air call accept, browse images from the gallery and no auto rotate even when all these functions are enabled. Auto brightness does not work too (Yes, it is enabled).

After rooting I have removed few apps using Titanium backup. Did I removed any app which controls the gestures? Please let me know what to do to have gestures back. Also if I unroot my device, will I loose the data? I see that stock firmware is about 1.6 GB where as rooting file took only few mega bytes. So, is it possible to unroot without losing data?

Any help would be greatly appreciated.

Thank you for your time.