Motorola Droid X :: Low Volume From Speaker When Using Apps Like Youtube Or Google

This is a different problem than the several threads that talk about low volume from the speaker. My normal speaker volume is adequate, except perhaps in a very noisy environment. But this is what is happening: At some point speaker volume will be normal and then later in the day I use an app that has sound, like YouTube or Google Maps navigation. The sound from the speaker is so low that I have to hold the speaker up to my ear to hear it, even in a very quiet room. Much lower volume than it usually is. I push the up volume rocker and it shows that Media Volume is already at the max. It is as if something muted the speaker, but not quite fully muted it because I could hear it by holding it to my ear.

The first time it happened, I had opened the YouTube app and played a video. The speaker volume was so low I had to hold the speaker to my ear. I plugged in some headphones to check whether the volume was normal there. It was. When I removed the headphones from the jack, the speaker volume returned back to normal................