Notifications volume

[AC Question]

When I set the phone to MUTE and then later turn the sound back on, the volume of my notifications automatically shoots up to MAXIMUM volume. I typically have it set at about half the volume but without any intervention on my part, the volume is set to the highest level. It just started I think with the newest update. I have a Samsung Galaxy 6s. The software was updated to G920VVRS4CQA3 on Feb. 1, 2017.