I've been using the same sys.txt. There are no sound settings in it.
I cleared the cache partition and reinstalled the app, it did not help. Here are the steps to reproduce the problem on my phone.
1. Start iGO.
2. Press the home button.
3. Press the power button or wait for the display to turn off
4. Wait 5 minutes.
5. Go back to iGo.
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