After some time connection stop at transfer rate 0 B/sec until restarting rclone

Hi, im uploading a lot of data to 1fichier, but after few hours or gigabytes, transfer threads/connections stop one by one. Is this a known problem?

For example i set the sync/copy to have 4 transfers, after 2 hours 1 transfer upload rate will be 0 B/sec at the middle of a file upload, then after 3 hours other other connection becomes 0 B/sec too, and this continues untill all become 0 B/sec. Then i close rclone with ctrl-c, and restart with the exact same command, then i works again for few hours/tens of gbytes, and does the same again.

Same happens if 1 or 2 transfers are allowed.

Looks like some weird rate limiting, but resets even if i instantly restart, but no any unusual, error or warning log message appears. however not -vv is used, just -v else the log would be huge after few hours.

Is there a way to make rclone recognize this and internally restart the transfers, without the need of closing and re-starting the rclone process?

Rclone version

rclone v1.72.1

  • os/version: ubuntu 24.04 (64 bit)
  • os/kernel: 6.8.0-90-generic (x86_64)
  • os/type: linux
  • os/arch: amd64
  • go/version: go1.25.5
  • go/linking: static
  • go/tags: none
rclone sync phydisk:/media/sanyika/bck0021/ 1fichier:/ --exc
lude=/film/**  --exclude=/dupe_*/** --exclude=**/7ajgu8at7utsa20oct2eiiaon8/** --excl
ude=/mentitos/** --transfers=4 --checkers=4 --modify-window=5s --no-update-modtime --
fast-list  --order-by size,desc -v

rclone config redacted
[1fichier]
type = fichier
api_key = XXX
[phydisk]
type = local

hi,
i would rclone copy --transfers=1 just one singie file, note the time when the issue occurs and look into the debug log at that time.

based on rclone docs, that flag does nothing.