Intermittent 500 Error when calling OS Data Adaptor using Rest API 5.2.0

We have several applications calling OneStream data adaptor via Rest API. Very frequently and randomly the connection fails with a 500 error. If we wait and retry the connection is successful. We have not been able to find the root cause. 

We observed that when the Rest API has 2 entries in the Log Activity table in OneStream the connection is successful. The screen shot is from the Logon Activity table in OneStream. Every so often the connection fails with a HTTP 500 Error and we observed that only one the set is entered in the table.

Have any of you encountered this type of issue.