Have you problem with the new SuperSU?
I have read this: "Be careful with that version of SuperSU. It is not yet stable (on the N4 at least). There is an issue where for some reason (and we haven't figured it out yet), you lose root, and the daemonsu process starts eating up ~70%+ of your CPU time. Battery dies pretty quick. "
Samsung Galaxy Nexus i9250 Android JB 4.3 rooted
Asus Nexus 7 2013 32GB Android KK 4.4 rooted
Samsung S III Mini Android JB 4.1.2