[LAU] Jack and CM-Headphone Codec audio recurring gets corrupted

Hi all, I have a super cheap C-Media USB Headphone Set based sound card (it's all over ebay as a guitar-link). It isn't awful quality wise (I was expecting worse, although it did require a bit of soldering to get it working at all..), so I'm interested in getting it working well, however when I run duplex jackd I have a problem: With -p64 -n3, approx every minute the recorded audio gets corrupted for about 15 seconds, then it sorts itself out for another minute. I've uploaded an example of the problem with a sine wave input here: https://dl.dropboxusercontent.com/u/51719910/CMJackIssue.ogg https://dl.dropboxusercontent.com/u/51719910/CMJackIssue.wav If I change to -p128 -n3 it happens approx every 2 minutes, and it doesn't happen in input only mode from what I can tell. Has anyone got any thoughts? Thank you Pete Linux version 4.4.0-38-generic (buildd@lgw01-17) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.2) ) #57-Ubuntu SMP Tue Sep 6 15:41:41 UTC 2016 /usr/bin/jackd -dalsa -dhw:Set,0 -r48000 -p64 -n3 -s -C -i1 jackd -v jackdmp 1.9.11 cat /proc/asound/cards 0 [MID ]: HDA-Intel - HDA Intel MID HDA Intel MID at 0xd7820000 irq 31 1 [NVidia ]: HDA-Intel - HDA NVidia HDA NVidia at 0xd1000000 irq 16 2 [Set ]: USB-Audio - C-Media USB Headphone Set C-Media USB Headphone Set at usb-0000:00:1d.0-1.5, full speed cat /proc/asound/card2/usbbus 002/012 cat /proc/asound/card2/usbid 08bb:2902