Updating with more information: I have just experienced this exact same issue with a Plantronics DA45 adapter (I'm assuming it's similar to the DA40), this time with Natty Narwhal (11.04).
Updating with more information: I have just experienced this exact same issue with a Plantronics DA45 adapter (I'm assuming it's similar to the DA40), this time with Natty Narwhal (11.04).