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Result = BSC_Initialize(HCI_DriverInformation, 0); Fails for second Stack initialization

I have modified the SPP Demo program to open a bluetooth stack, perform functions, then close the stack. I then perform some tasks that don't involved Bluetooth, but eventually I create a new stack. My problem is when I attempt to open the stack again, I encounter the DisplayFunctionError("Stack Init", Result); Result = Failed: -4.

Has anyone encountered this issue?