I have a Dell and it did this with all my applications. Whether I was listening to itunes, youtube, or netflix, everytime I press pause for a second, whenever I pressed play once again it got at least twice as load. I am running on windows 10 and this fixed the solution. I only really noticed the loudness when I connected ear phones. Basically, go to the search bar and type in "Find and fix audio playback problems". Then click on it when it pops up under the settings category. A "Playing Audio" window will appear. Click "next" to troubleshoot the problem. Make sure you earphones are plugged in. If a window opens that only troubleshoots as a speaker, there is your problem. Troubleshoot and keep hitting next until your music plays better. It will lead you to a testing window where it gives you noises and you say if it sounds fine or not. Say it doesnt sound right and to look for another driver malfunction. Everytime it updates your sound drivers, apply the changes and close the box. Then test out to see if the sound changes everytime you press pause. This should work! if it doesnt, go through the process again.
You know you have succeeded when it updates you to have a speaker, earphone, and HDMI Digital audio on your computers sound settings. To reach this setting, type in the search bar "sound". click on sound under the control panel section. A "sound" window will appear. If under the playback tab there is only a "speakers" device to modify settings, those setting will not help you with the pause and play problem. Those are only for your speakers! you need a headphones device settings, however, windows 10 didnt add the device for some reason. If the headphones device is not showing up, keep updating like i said above (the find and fix audio playback method above) until it upgrades you to more devices. There should be a "speakers", "headphones" and "digital audio" device available for connection after a while. Once you see that the repairs added new devices for you, then you can turn off enhancement for headphones if required.
For some reason, my computer thought it only had a speaker so when i connected my earbuds, they played louder everytime i pressed pause so I had to adjust it everytime i paused.
Its a long process but i hope this helps!