I brought a new S4 mini 4 days ago, the model is SGH-I257M and the firmware is 4.2.2 , unrooted.
However, it lags exactly every 5 minutes for roughly 2-4 second. It starts happening whenever I turned on the phone.
I noticed this problem when I was playing "Puzzle and Dragon". This problem pissed me off cuz the lag stops me from moving the orbs.
I took some screenshot with the CPU usage function turned on .
the first four pictures are taken when the lag happens (roughly 3 seconds) while the last one is taken when it is normal.
So the system_server shows a sudden high cpu usage every 5 minutes. Hope you'll help me.
P.s. I only downloaded whatsapp, puzzle and dragon, smash hit and cpu-z.