Magento2 error 400

I am trying to import a large ITScope export (1100 items) through the synesty studio and after 134 products I get a 400 bad request error:
Step: SpreadsheetUrlDownload
Product Upload: ERROR:Too many errors: (3 / 3). Last error was: HTTP status code error: 400 (Bad Request) (Origin: Caused by the remote side e.g. another server, API or webservice. Kind of error: Something could not be accessed (e.g. a server, a url or a file) or access was refused. Root error: HTTP status code error: 400 (Bad Request) (Errorcode: HTTP_TOO_MANY_ERRORS | REMOTE | ERROR))

Is this something I need to fix in my server?