Request times out but http logs show response (org.apache.http.client.ClientProtocolException)

Certain requests I make will timeout with the error below in the Error logs

2020-11-12 09:53:08,983 ERROR [WsdlSubmit] Exception in request: org.apache.http.client.ClientProtocolException
2020-11-12 09:53:08,983 ERROR [errorlog] org.apache.http.client.ClientProtocolException
org.apache.http.client.ClientProtocolException at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:839)

The HTTP log however, shows the correct response. So clearly the call went through successfully. This isn't very helpful though as each time I run a test case, some test steps timeout and the assertions aren't working correctly.

Any ideas as to why this is happening? Anyone else have a similar issue to this?

More information on what I'm doing:

- Request is already Authenticating Preemptively

- Request has an assertion to check for Valid HTTP Status codes

- I am using SoapUI 5.6.0 Open Source

- Testing the same request in Postman doesn't have this issue

- Other the same API with different request payloads work correctly. It appears to only happen when I'm intentionally using incorrect values