2) Does anyone know how I might be able to fix it?
I have a problem that has started to occur over the past couple of weeks. The "System Volume" becomes muted and inaccessible. When I go into settings (as shown below), the slider is at far left (zero level), and it is greyed-out, so that I can not control it.
Settings ^ Sound ^ Volume
- Music, etc (active slider)
- Ringtone (active slider)
- Notifications (active slider)
- System (slider at zero level, slider is inaccessible)
My phone SG-Note-3 is unrooted and still locked onto Bell network (similar to ATT). The only change I have done in the past few weeks, is install one new app from the Google Play store - "Delayed Lock", paid version. Of course, I have many other pre-existing apps, for which some of them have automatically updated during these recent weeks.
My only way to reactivate the System Volume is to reboot the phone. Then the volume works and continues so for a few hours, or a day or two. Then it becomes inactive again, but I haven't determined what triggered this inactive state.