Regarding your second point, Windows 10 has a feature to lower the volume of other apps when it detects communication activity.
I got bitten by that using another VoIP client (not Skype).
How does one think "Hey let's use Skype" in 2020 is beyond me. There have been much better options for years.
First: fans take off.
Second: Skype lowers all volumes of all other apps without asking.
Third: some people now have a weird floating bar in screen during the game, if clicked by accident the game minimizes.
Fourth: sound quality is horrible. How can a built-in, afterthought like Voice comms in LoL be better than a program written from the ground up to do voice calls?
Fifth: after the game ends the group has 3 spammers sending them a message since they logged into Skype.
Never again.