Http Client Get Service failed on IO Exception - Error trying to append byte response from PS to response document *|* -E

Http Client Get Service failed on IO Exception. The problem does not happen all the time. The BP can be succeed at most of the time.

Customer is on GIS 4206 production box with 4 nodes cluster. The issue was happened on node 4.
The error message in status report is:

HTTPClientGetService resumed with error.
HTTPClientAdapter [HTTPClientAdapter-Node4-PS4]
ServiceStartTime [2008-08-01 07:15:20.258]
ServiceEndTime [2008-08-01 07:15:21.524]
SessionToken [HTTPClientAdapter-Node4-PS4_HTTPClientAdapter_node4_121758932021353:78950482<br />
HTTP Status Code: -1
HTTP Reason Phrase: Internal Error: Error trying to append byte response from PS to response document [Error occurred while attempting to write the message body/entity: [Error occurred while attempting to write the chunked message body/entity: [null]]]

The error message in status report is:

HTTPClientGetService resumed with error.
HTTPClientAdapter [HTTPClientAdapter-Node4-PS4]
ServiceStartTime [2008-08-01 07:15:20.258]
ServiceEndTime [2008-08-01 07:15:21.524]
SessionToken [HTTPClientAdapter-Node4-PS4_HTTPClientAdapter_node4_121758932021353:78950482<br />
HTTP Status Code: -1
HTTP Reason Phrase: Internal Error: Error trying to append byte response from PS to response document [Error occurred while attempting to write the message body/entity: [Error occurred while attempting to write the chunked message body/entity: [null]]]

Error in Httpclient log is:
[2008-08-05 18:17:30.942] ERROR <HTTPClientAdapter-Node4-PS4_HTTPClientAdapter_node4-Thread-191> 000000000000 GLOBAL_SCOPE ResponseDocumentOutputStream.write(b[]) - Error occurred while attempting to write the message body/entity: [Error occurred while attempting to write the chunked message body/entity: [null]]
java.io.IOException: Error occurred while attempting to write the chunked message body/entity: [null]