android - Lollipop inconsistent CPU usage on Galaxy S4 -

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i'm developing game android , testing on samsung galaxy s4.
however, i'm finding since i've installed lollipop (5.0.1) on game freezing approx. 200ms every often, causing drop around 10 frames.

the game has been tested on multiple other (non-s4) devices running lollipop , not doing this.
going cpu usage monitor in android studio, i'm having complete opposite more common (upward) spikes in cpu usage. i'm finding cpu usage spiking down instead of up.

cpu usage spikes

is common problem lollipop/galaxy s4?
have suggestions on can find out causing this?


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