[LAU] Lexicon Lambda USB - are my lockups due to the hardware or software?

Hi all, Ubuntu Xenial 16.04 LTS, kernel 4.4.0, kxstudio. I have a problem with my Lexicon Lambda soundcard (new to me, purchased second-hand). Every now and then, it seems to lock up when I have Jack and Ardour running. syslog contains many lines like: 15 Apr 10 10:35:01 cubase kernel: [ 1072.193677] usb 3-3: 1:2: cannot get freq at ep 0x1 16 Apr 10 10:35:01 cubase kernel: [ 1072.195991] usb 3-3: 2:2: cannot get freq at ep 0x82 I found a post https://www.spinics.net/linux/fedora/alsa-user/msg01899.html suggesting that this device flouts the USB spec, and sure enough: antony@cubase:~$ lsusb -s3:8 -v |grep -E "(bNumInterfaces|bInterfaceNumber)" |sort|uniq Couldn't open device, some information will be missing bInterfaceNumber 0 bInterfaceNumber 1 bInterfaceNumber 2 bInterfaceNumber 4 bInterfaceNumber 6 bInterfaceNumber 7 bNumInterfaces 6 I seem to have to hard-reset the card, kill and restart pulseaudio (8.0) and jackd (1.9.11). My concrete questions are: Am I wasting my time with this card? Are the errors purely cosmetic (and something in software is locking up?) Antony -- http://www.linkedin.com/in/antgel http://about.me/antonygelberg