CPU usage steadily climbing to 70% on almost blank screen

hi there,
this problem has been plaguing me month.
this ios app. on 1 screen has 4 button components @ bottom, 320*400 square , nothing else cpu usage observed climb 20% 70% in space of 1 minute @ point drops begin climbing again. there no code being executed , memory not increase.
this 320x460 (windowed, non retina) in gpu mode.
thanks reading.
luke

actually memory showing similar behavior of increasing , dropping down (remember no new objects being created , no code running)

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