Thanks for your reply. Sorry, I am referring to the staff version of the NRE Darwin Web Service. The issue started about an hour or so ago although a similar problem has come up before. I have not received errors from endpoints other than GetDepartureBoardByCRSRequest. As mentioned earlier, the issue is intermittent and the request often returns a successful response after a few retries.
<soap:Header>
<typ:AccessToken>
<typ:TokenValue>XXXXX</typ:TokenValue>
</typ:AccessToken>
</soap:Header>
<soap:Body>
<ldb:GetDepartureBoardByCRSRequest>
<ldb:numRows>150</ldb:numRows>
<ldb:crs>EDB</ldb:crs>
<ldb:time>2021-07-07T17:56:13.1870000+01:00</ldb:time>
<ldb:timeWindow>120</ldb:timeWindow>
<ldb:services>PBS</ldb:services>
<ldb:getNonPassengerServices>false</ldb:getNonPassengerServices>
</ldb:GetDepartureBoardByCRSRequest>
</soap:Body>
</soap:Envelope>