I've been getting some error 16s lately. Seem to be solved by enabling smb3 in DSM. Keeping an eye on it. I believe DSM 6.1 will likely solve it once and for all by allowing me to turn off AFP and use SMB with time machine, but I haven't installed the beta yet. Will try it on the box that is acting more goofy (only one of my two 3612s is acting odd from time to time) and report.