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Upgraded the phone (6) to 9.1 yesterday, and tones still broken for only Reminders. Get the vibrate, but no tone. All other apps that use Notifications are working properly.

Reminders tone worked after update, but this morning, nothing. Work around of restarting the phone seems to work, but annoying to remember to do it every morning. /insert joke about "just set a reminder".
 
The latest update seems to have fixed my alert issue re: only Reminders not issuing a tone.

Not ready to declare truly fixed, but right now, working next morning vs. next day no longer working.
 
Arrrg! Back to not working on just Reminders and just on my iPhone. Configuration and usage patterns are the same between iPad and iPhone, same OS level. Yet Reminder tones work on iPad 3, does not work on iPhone 6 after some amount of time.
 
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