Volume buttons not working iPhone 4S?

Hi all, so basically there is a problem with my phone where the volume buttons won't work, bu this I mean that I can't watch videos or listen to music without my earphones. It happens almost everyday at a particular time and just happens suddenly… Anyone have any ideas why this is happening?

Maybe something happened in the settings.go to setting press general and check the volume of your iPhone. If that doesn't work just press the button harder. Or maybe it just needs a little break if you use it a lot.