Ringer volume keeps changing | iphone 6 iOS 8.1
Running iOS 8.1 on an iPhone 6.
I'm finding my ringer / alert volume changing even though I've disabled the 'Change with buttons' options in sounds settings.
Not sure if it's the result of changing some other volume on the system or an app. I can't ever seem to change it deliberately but every now and again I notice the ringer /alerts are louder than normal and when I go into sound settings the slider is higher than I originally set and the 'Change with buttons' still disabled.
Any ideas?
iPhone 6, iOS 8.1