Occasional Freezing and Music Skipping

Hey everyone, quick question, curious if any else experiences this. I have my VZW G4 rooted and have some optimizations. Kernel Adiutor tweaks, Greenifying apps etc. I notice sometimes that the UI freezes for a second or two then comes back to life and sometimes when playing music with the screen off the music will stop playing for a second or 2 then come back on. The music is locally downloaded from Spotify so I know it's not my data connection dropping off. Anyone else experience something similar or have any recommendations? Thanks!