Bluetooth controller falling off USB bus after an hour of continuous BT headset usage

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Dear linux-usb list,
I'm having a recurring issue with my on-board Bluetooth controller
falling off USB bus after about an hour of continuous usage:

[91080.440903] usb 2-6: USB disconnect, device number 24
[91080.450545] Bluetooth: hci0: setting interface failed (19)
[91080.685270] usb 2-6: new full-speed USB device number 25 using xhci_hcd
[91080.812297] usb 2-6: New USB device found, idVendor=8087, idProduct=07dc
[91080.812301] usb 2-6: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[91082.876329] Bluetooth: hci0: command 0xfc05 tx timeout
[91082.876332] Bluetooth: hci0: Reading Intel version information failed (-110)

Unloading and loading the btusb module helps get it running again:

[91099.099276] usbcore: deregistering interface driver btusb
[91101.678422] usbcore: registered new interface driver btusb
[91101.693151] Bluetooth: hci0: read Intel version: 370710018002030d56
[91101.693154] Bluetooth: hci0: Intel device is already patched. patch num: 56
[91103.580276] Bluetooth: hci0: SCO packet for unknown connection handle 0
[91103.590133] Bluetooth: hci0: SCO packet for unknown connection handle 0
[91103.590137] Bluetooth: hci0: SCO packet for unknown connection handle 0
[91105.537140] input: 50:1A:A5:D7:43:93 as /devices/virtual/input/input28

The last line indicates my BT headset reconnected successfully.

Could you give me any pointers for debugging this? I cannot trigger
this on-demand, but when I'm in a conference call, it occurs within
an hour or two of continuous usage of my BT headset in HFP mode.

I originally reported it against the Bluetooth stack here:
https://bugzilla.kernel.org/show_bug.cgi?id=198803
but I'm not sure if it's an issue with Bluetooth stack or the USB stack.
You can find dmesg and lsusb output attached there.

OS: Fedora 27
kernel: 4.15.7-300.fc27.x86_64
driver: btusb/btintel
device: 8087:07dc

Regards,
Dominik
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