occasional Internal Server Error - 500 in android endpoint method

[Sandeep]

am getting this occasional "internal server error" in android endpoint method. retrying it works many times! below is the logcat:

W/System.err: com.google.api.client.googleapis.json.GoogleJsonResponseException: 500 Internal Server Error
W/System.err: Unknown Error
W/System.err:     at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:113)
W/System.err:     at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:40)
W/System.err:     at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:312)
W/System.err:     at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1049)
W/System.err:     at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:410)
W/System.err:     at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
W/System.err:     at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460)

 btw there is no log entry registered on the backend console, which is making it very hard to catch. does anyone have any idea on this? thanks.