After updated my Venu3 on Friday some data cannot be synced anymore

After updated my Venu3 on Friday some data cannot be synced anymore.

I disconnected and reconnected my watch from Garmin Connect and then it synced my sleep data, but still my stress data is missing.

The Device sync audit says:

Server was not able to process the uploaded file

and another:

Archived destination failed: file (long number with dashes) was accepted but previously uploaded 409 to {garmin url}

Hope you can help!