This also looks suspicious too (dmesg.log):
[14076616.248406] audit(1294765455.905:2753): type=1503 
operation="inode_permission" requested_mask="w::" denied_mask="w::" 
name="/var/run/samba/winbindd_privileged/pipe" pid=23931 
profile="/usr/sbin/cupsd" namespace="default"

I wonder if AppArmor profile for samba is causing problems for you.

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https://bugs.launchpad.net/bugs/526464

Title:
  intermittent authentication: check_ntlm_password:  Authentication for
  user [someuser] -> [someuser] FAILED with error
  NT_STATUS_ACCESS_DENIED

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