Hi,
with my experience, that's probably not because of cookies.
At any time, when you want to start a CC, you have to do a Stop before. So to do a Stop, then a Start.
Have a look on CC monitoring... if your CC is on "manual" or "automatic" mode, and if your CC is already started... well... you cannot click on "start" button !!, you have to click on "Stop" button before to be able to click again on "Start". My conlusion (several years ago) was that's certainly same behaviour when we trigger externally a CC.
"Stop + Start", that's the minimum.
regards.
Mickael