Sound Bug - Bottom speaker sound going through ear speaker/not working at all.

Occasionally the sound in the bottom speakers will stop working and some apps will play through the ear speaker instead. When this happens Google Music, Youtube and some other apps won't work at all. For example pressing play in either of those apps does nothing, as in the play button never changes to a pause button. My alarm app on the other hand plays through the ear speaker instead of not working at all. The ear speaker sound volume is very quiet and doesn't appear to be controlled by the media volume either.

The only remedy that I've been able to find for this is a phone reboot

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