when I disconnect the call, the call screen will not switch off immediatly.. y?

screenshot is not working. (home button + power)

dear samsung,I using Samsung J7 Series. where is inbuilt call recorder?please solve this in next update.

how could be same time in bangalore and new delhi?please check this and solve it.i hope answer from samsungthank you

suddenly switch off, says reset phone.unable to verify your device. if i press power button it ask to restart. den it restarts. but why it happening? please suggest me. i hoping u answer me quickly.thank you