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Latitude 5175: Bluetooth woes

So after not having used my bluetooth for a while, I tried to use my BT mouse.

Initially, it can connect but only holds connection for 30 seconds before dropping (despite saying it's still connected in the bluetooth settings window)

Then I unpaired the mouse to re-pair it...and now the bluetooth state is completely unalterable. The setting window is there, but the on/off switch in the window is gone. 

Furthermore, device manager shows a new device failure in the USB section" Unknown USB Device (Device Descriptor Request Failed).

All my drivers are updated. In fact I even downloaded the generic BT drivers for the Intel AC 8260 wireless chipset (which were slightly newer than Dell's). No dice.

Any experience from other users here what's wrong, and how to fix it?

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