Auto cookie cleaning....?

Hi all,
Just a quick question, I also run 2 Lenovo Tabs S6000 & B8000, JB & KK respectively along with my little Moto G on KK.
What I would like to know is it now common practice with Android O/S to clean cookies/cache/web history on a regular basis (I've mostly noticed this when I unlock screen)
If so when did this start being implemented,and is it necessary to be done at least 4/5 times a day...that I notice....

Regards Angela Cusack emoji4.png

Sent from my XT1032 using Tapatalk

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