Notification volume goes down all by itself

We have two Captivates and they both have the same problem.
We set the control for notification volume slider to max and when a notification happens, it goes down to almost minimum all by itself.  We did a factory reset - what a pain to reload all apps and pics afterwards.  The reset didn't stop the problem,  Any ideas?

Thanks Joey.
I downloaded it and set it up.
As soon as I got a text, the notification volume on the phone dropped.  If I go to "settings" and "sound" it shows a low level on the slider.  If I open up the sound app- it still shows as set to max and when I go back to "settings" and "sound" - it has moved back to max.  So, I would have to reopen the app after every message to reset it to max.  I do that now by going to settings to reset each time. Thanks for trying.
Any other suggestions, people?