Cpu and or resource use

Cpu and or resource use.

Does any one know why if you stop asterisk using
service asterisk stop
it puts a heavy load on the cpu?
I am using free bpx and installed distro with linux compiled to the iso.
cant stop asterisk with out over heating or going over 50% cpu
once asterisk resumes cpu status goes way down

PS this has been going on for over 2 months now that i have been tracking so sense i just got live stream working less than 3 hours ago i think that would be a cheap shot