So I finally figured out how to avoid triggering this problem.  The clue
was from dmesg:

[ 4130.799255] Bluetooth: hci0: last event is not cmd complete (0x0f)

Which finally led me to changing in /etc/default/tlp the following line
from 0 to 1 :

# Bluetooth devices are excluded from USB autosuspend:
#   0=do not exclude, 1=exclude.
USB_BLACKLIST_BTUSB=1

Which seems to do the trick.  This means that for me the problem is
fixed.  However, the tlp package is specific to Thinkpads and the
prevalence of at least the "last event is not cmd complete" line on the
net would suggest that other systems can be similarly afflicted.  The
crash triggered here is too obscure to let the average user make the
connection to USB autosuspend.  So there really should be some more
helpful error message for this form of interaction resulting from USB
misconfiguration.

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https://bugs.launchpad.net/bugs/1765860

Title:
  blueman-browse crashed with blueman.bluez.errors.DBusInProgressError
  in warp(): Operation already in progress

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