My samsung M21 is dead slow in the daytime,but after 8pm becomes super fast. Almost an Vampire phone

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During the day, it is hardly possible to pickup calls if you are in midst of any app. At night, the phone simply works as if nothing was wrong. I have Bitdefender antivirus also installed on phone. The phone is bought just a week back and for the first two days it was working normal.
I observed the battery being consumed by CameraLightSensor, almost 25%, so switched it off.
By disabling the second SIM, the phone improves a little.
I have recently (1st October 2020) updated the software and I doubt this update has something to do with this ghost activity of phone.
Has anyone solution to this?

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