When I use Python code to download Sentinel-3 OLCI level 2 images of in bulk in year 2018, one error happend. But when I use this code to download the images in year 2017, no error occured. The details was as follows.
The first sentence already says it.
“You have sent too many requests in a given amount of time.”
Maybe the download for the 2017 products takes longer and and thus less requests are send in the same period of time.
Maybe you have to limit the number of requests manually.
According to this post here, you should better use /apihub instead of /dhus.
For more educated answers you better direct your question to
eosupport@copernicus.esa.int
Thank you very much!