You may have already tried this, but have you tried the devices in different USB ports and in different sets of USB ports (e.x. front and back ports)?
-- USB ports unreliable https://bugs.launchpad.net/bugs/246608 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
