Dropbox & "failed to grab locks"

Just using --delete-before to help case correct some image file names in dropbox.

I get a bunch of “Failed to grab locks”, e.g.

2017/03/03 11:48:17 Pictures/…/pmg_0861.cr2: Couldn’t delete: Failed to grab locks for 13994345: lock held by connection 26666781. Please re-issue the request.
2017/03/03 11:48:26 Pictures/…/pmg_1555.cr2: Couldn’t delete: Failed to grab locks for 13994345: lock held by connection 26716947. Please re-issue the request.
2017/03/03 11:48:26 Pictures/…/pmg_1444.cr2: Couldn’t delete: Failed to grab locks for 13994345: lock held by connection 26974402. Please re-issue the request.
2017/03/03 11:48:26 Pictures/…/pmg_1511.cr2: Couldn’t delete: Failed to grab locks for 13994345: lock held by connection 26566257. Please re-issue the request.
2017/03/03 11:48:40 Attempt 1/3 failed with 5 errors and: failed to delete 5 files

Is this, at a guess, because there are multiple connections to the remote drive, e.g. the default appears to be 4?

If it is, is the right workaround to reduce the number of connections with --transfers=1 ?

dropbox seems to do this sometimes for reasons I haven’t worked out.

However rclone will retry the transfer so I wouldn’t worry about it too much.