I see in the logs where it fails, but there is no indication of why. I have been looking at the logs for some time now, still can't figure out the problem. I thought at first it was a space problem, but it isn't. It says memory, not sure from that point. Still looking.
Ran into the same thing using SnapMirror with error below, but cleared up on next scheduled job. Node rebooted 4 days later from hitting bug BUG 1157562: An internal memory leak might lead to reduced performance. Fixed in 9.3 an beyond.
'Transfer failed'. Last transfer error was 'Transfer failed. (Out of memory)'.