Why is my phone switching to vibrate

[AC Question]

My phone keeps switching to vibrate after every call. This is so annoying. What can I do to fix this problem. I have a Samsung s6

 

[Homer Simpsons]

Hi I don't know which phone you got, however, I had this problem with Pixel XL and called Google so many times with no help. What I did was using the app called MacroDroid and I set up that every time I finish a phone call, the phone will wait 10 seconds and increase the volume to max. Let me know if you need additional help.

 

[Homer Simpsons]

This is how I set it up.