Why does my samsung galaxy s7 edge lags while ending a call ?

[Android Central Question]

I have a 32 gb Samsung galaxy s7 edge which has a problem of taking 4 seconds more after hanging up the call to show the messege of "call ended" . For eg. if it disconnects the call at 08:20 mins, it vl show 08:24 "call ended". sometimes it works well and sometimes it doesnot. Please help...thank you in advance