Sony has released Marshmallow beta update and what is more exciting that STAMINA Mode is back,
Previously Sony removed it and it was loved by the customer because it shut downs app processes when they are not in use.
STAMINA Mode feature was removed when Sony released first builds of Marshmallow.
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They also might be working on this feature to be more effective or might be it was not working perfectly,
And That’s why they removed it.
The new update was for selected users who participated in Sony’s Beta program.