"CoreBluetooth[WARNING] Unknown error: 1309" message cause

I am sporadically getting the message "CoreBluetooth[WARNING] Unknown error: 1309” on the console when running a BlueTooth app I am developing. Even though the message states that it is a warning, it stops execution of the app. I have been able to work around this problem by turning the Bluetooth setting off and then back on. Can anyone tell me what is causing this and what I should do to avoid it?

I posted this problem on [email protected] Bluetooth <[email protected]> and received this response from Jason Conn:
If I had to hazard a guess, I’d say that the primary reason you haven’t received much of a response is because you’ve given no description of your issue beyond “sometimes I see error 1309 and things stop working”.
If you haven’t already, please file a bug on bugreporter.apple.com and include as much detail as possible - a description of what you’re trying to do, repro steps that lead to the issue, even a test app. Respond to me directly with the bug number, and I will follow-up.
I had hopedsomeone at Apple could look into the code and state the conditions that led to this warning message. I was not able to reproduce the problem sufficiently reliably to file a bug report. Maybe you can.

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"CoreBluetooth[WARNING] Unknown error: 1309" message cause

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