Volume problems

I'm having problems with the volume on my Nokia 3.4 smartphone. The volume for incoming calls is now very low and I can't increase it. Some of my notifications aren't coming through. When I try to adjust my volume level the two volume icons appear, the media icon resembling a musical note is black and won't change, whilst the ringer icon 'bell' is blue and does increase/decrease when using the control level at the side of the phone.

Does anybody have this problem and is their a solution to this?