List employments of a given Person sometimes gives 502 Bad Gateway

Hi,

For our datawarehouse we want to be able to collect all employments. At seemingly random points during the data collection we get a 502 Bad Gateway error from the API. When trying to collect a new acces token i then get the error: Remote end closed connection without response

Is there a limit on the number of API calls? I allready tried increasing the interval time between api calls to 2 seconds which seemed to help but the error still pops up sometimes.

Any tips on how to work around this error?