HPE-390t Bluetooth issues on Win7 Ultimate

I have an HPE-390t that is running Win7 Ultimate (which came with it when I purchased it from HP).  Lately, Bluetooth has been very iffy on the machine and I'm not sure if it's a hardware or software issue and how to resolve it either way.  Sometimes when I start up the Bluetooth icon appears in my system tray, and other times it doesn't and I have a Unknown Device listed under Universal Serial Bus controllers in Device Manager (although it's possible that's listed there even when the Bluetooth icon appears and Bluetooth is working - it's not working right now, so I have no way of knowing if that Unknown Device is there when it is working until it starts working again).  Any help on how to troubleshoot and/or fix this is greatly appreciated.  Thanks.
Marc

Is your desktop PC still in warranty? Check your warranty status Here.
You can troubleshoot it by using the Device Manager to identify the unknown device when it appears. If the unknown device is the bluetooth transceiver then you will have found the cause to be a failing transceiver.
How to identify an unknown device in Windows 7
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