Well that's weird, Greenify keeps telling me it has problems hibernating com.sec.android.sviewcover, which i've disabled since i dont have one.
PS, to confirm your findings, i too had problems on stock kernel (*NG2 SEE) and i did wipe a lot of APK's, but most of them are non-samsung, i prefer RW rights over /system above scripting and debloating apps.
Do you by any chance have Xposed installed? if yes, what modules?
I've enabled the physical buttons for picking up and ending a call, if it wasnt up to them, i'd have to wait until the process re-opens so i can slide the thing...this is getting really annoying