Default [Q] Ghost/ Phantom notifications

I'm running an S4 I545 MJ7 rooted. I noticed today that my phone was making notification alerts (sound on) but nothing was there in the notification bar. I turned it to vibrate and about 5 minutes later it would phantom vibrate about every 1-2 minutes for the next 15-20 min. I checked my sound settings and alerts but all looks right. Any ideas?
Thanks,
Michael S