Try and throttle down simultaneous targets. You may be saturating bandwidth, throughput, or disk I/O.
I had a a similar problem lik yours: a autoremetiation ending with the messages:
failed to create configuration file C:\..........
and the Job ends with:
Dryrun failed for server xxxxx Exit code = -4000
Afther a lot of time searching in the access rigths I found the the misstake !
The Name (inkluding path) of the remetiations job has exeeded the limit of 256 chars!