Windows Phone 8.1 Bluetooth LE Issue

Hello Everyone,
I have a Bluetooth LE device, and have written an app to interact with it. It usually works fine, but after a period of time (less than a minute), the "Characteristic Value Changed" event stops firing. I know that the device continues to send data,
and the issue doesn't happen with another (non WP) device I have. The only indication I have that something changed is that VS has an entry for "The thread 0x17c0 has exited with code 0 (0x0).". The thread location obviously changes each time but
the exit code never does. This doesn't cause an error to trip. The app continues to function normally, but the event handler for a change in characteristic never fires again. If there is no way to prevent this, is there at least a way to detect it so I can
reset the connection?
var tempService = currentDevice.GetGattService(new Guid("00002220-0000-1000-8000-00805f9b34fb"));
var charA = tempService.GetCharacteristics(new Guid("00002221-0000-1000-8000-00805F9B34FB")).First();
await charA.WriteClientCharacteristicConfigurationDescriptorAsync(Windows.Devices.Bluetooth.GenericAttributeProfile.GattClientCharacteristicConfigurationDescriptorValue.Notify);
charA.ValueChanged += charA_ValueChanged;
Thanks for any help you can give,
Jake

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