same thing happened to my eagle cdc v6.0
i dont know how or why it happened because it was working normally before it did that. i had it sent back to the distributor (?) in HK, through our lhs. got it back after about a month. paid about $40.00 (im from the philippines and i think 50% of what i paid was for shipping.) it works fine now, 2 years and counting since the repair