rclone: dropbox (batch) upload encounters internal_error/, eventually stalls for hours

The associated forum post URL from https://forum.rclone.org

What is the problem you are having with rclone?

Periodic “batch didn’t complete” errors, and “internal_error/”, eventually stalls for hours.

$ rclone --compress-level 6 copy --max-age 24h --immutable data dropbox:abcd-db/2021/ab/data --transfers=16 --fast-list -P
2021-07-28 00:27:30 ERROR : Dropbox root 'abcd-db/2021/ab/data': sync batch commit: failed to commit batch length 3: wait for batch failed after 120 tries: batch didn't complete
2021-07-28 00:57:38 ERROR : Dropbox root 'abcd-db/2021/ab/data': sync batch commit: failed to commit batch length 9: wait for batch failed after 120 tries: batch didn't complete
2021-07-28 04:24:40 ERROR : Dropbox root 'abcd-db/2021/ab/data': sync batch commit: failed to commit batch length 2: wait for batch failed after 120 tries: internal_error/
2021-07-28 04:37:48 ERROR : Dropbox root 'abcd-db/2021/ab/data': sync batch commit: failed to commit batch length 1: wait for batch failed after 120 tries: internal_error/
2021-07-28 09:09:56 ERROR : Dropbox root 'abcd-db/2021/ab/data': sync batch commit: failed to commit batch length 1: wait for batch failed after 120 tries: batch didn't complete
Transferred:       47.007Gi / 94.672 GiByte, 50%, 0 Byte/s, ETA 0s
Transferred:         9874 / 19898, 50%
Elapsed time:  13h12m36.2s
Transferring:
 * 16/1603f1e23740fdc0409…b92b03273b94a4d7994f13:100% /4.351Mi, 0/s, 0s
 * 16/16047c392cef6414c62…d865c52cd2d52fde0b5e65:100% /4.636Mi, 0/s, 0s
 * 16/1605dc8faed7a97b6bd…3438aa9271816e1648eb48:100% /4.117Mi, 0/s, 0s
 * 15/1567bd4c08f70c36bbc…f3f5db36379d3232bd628c:100% /5.355Mi, 0/s, 0s
 * 15/156ed0c5721219d689e…816a40ec6221eb3afdbcd2:100% /4.329Mi, 0/s, 0s
 * 15/156effb85b203ff1779…80d73e24fe8f4e39b4ab1a:100% /4.113Mi, 0/s, 0s
 * 15/156f5780f0bf3d57449…9017b188391d5d62daa2b6:100% /4.320Mi, 0/s, 0s
 * 15/156fdf0842375137277…559906589bf2eeb15de4f2:100% /4.643Mi, 0/s, 0s
 * 15/15709b7f128dafbba0b…cd03e3ba53c4a09c0d891f:100% /4.260Mi, 0/s, 0s
 * 15/1570e79fbae580647e0…b65602d7daa0327437b7bc:100% /4.752Mi, 0/s, 0s
 * 15/15725bb2b702a4300aa…11e3eb291f8dfa35fbbe3e:100% /4.692Mi, 0/s, 0s
 * 15/157260c8b208be72180…e8f15f2a0a19d7d4f89f46:100% /4.638Mi, 0/s, 0s
 * 26/26f4361399afb974e2b…5bd21da68d5650530b7262:100% /6.773Mi, 0/s, 0s
 * 26/26f46f7f4c6a12a2059…2030baa9c2e93bbe8969ca:100% /4.063Mi, 0/s, 0s
 * 1f/1f62c5168ac628a2cdb…858604af9efbb8c8a36f39:100% /4.039Mi, 0/s, 0s
 * 2f/2f3a2118cd0763edf31…e0364bab861cd16e74f33f:100% /4.758Mi, 0/s, 0s

What is your rclone version (output from rclone version)

rclone v1.56.0
- os/version: debian 9.13 (64 bit)
- os/kernel: 4.19.0-0.bpo.13-amd64 (x86_64)
- os/type: linux
- os/arch: amd64
- go/version: go1.16.5
- go/linking: static
- go/tags: none

Which OS you are using and how many bits (e.g. Windows 7, 64 bit)

Which cloud storage system are you using? (e.g. Google Drive)

Dropbox

The command you were trying to run (e.g. rclone copy /tmp remote:tmp)

rclone --compress-level 6 copy --max-age 24h --immutable data dropbox:abcd-db/2021/ab/data --transfers=16 --fast-list -P

A log from the command with the -vv flag (e.g. output from rclone -vv copy /tmp remote:tmp)

Rerunning with -vv now. Will update when problems are logged

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