I've attached an egpu over thunderbolt to my Galago Pro and started to
see these messages. The connected bluetooth devices started to freeze
for 1-2 sec idle time from time to time, then these messages appear in
the syslog. The strange thing, that the USB devices plugged into the
egpu case are working flawlessly (one webcam and a mouse). I've tested
the 20.04 dev iso as well. it has the same issue.

It seems if I have a continuous use of bluetooth (like playing audio
with it) this issue does not happen.

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https://bugs.launchpad.net/bugs/1850172

Title:
  syslog flooded with these USB messages, but device doesn't exist

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