Hi Ken Not a lot of difference I'm afraid. Wondering whether you meant to make the interval 6000 for 6 seconds though? I tried dropping the interval to 6000 just in case and it  still only completed about 2 in 10 uploads without an error. The uploads are only taking 2-4 seconds each so I dropped it to 1000 and got a few batches ...

Hi Ken Afraid this is looking like a new/different issue ... I  installed the latest version, refreshed etc, but little change. (Possibly a slight improvement, hard to be certain) Still getting the error message on about 20-30% of uploads in any given batch (batches of 10 images) Batches of 2-3 produced 1 or more errors every ...