Some users of 2.17 and previous ROM versions have reported that not turning the screen off, but locking the screen and allowing it to dim after timing out, fixes the missed call issue. To try this, go to Start>Settings>System>Power>Advanced and uncheck the two "Turn off" boxes. Enable the dimming by going to Start>Settings>Backlight>External power and enable the check box, and the same in the Battery power tab. Instead of using the power button to turn the device off, use the lock feature and then just allow the time out to dim the screen.
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