OEM Issue: oemagent stops after some time on specific node on a 3 node RAC system.

We have a 3 node RAC system running 11.2.0.3 .
The oemagent keeps failing on 1 particular node and needs to be brought up every now and then. What could be the probable cause of this. Also, I have not seen anything suspicious in the agent logs.
Oracle Enterprise Manager Cloud Control 12c Release 2
Copyright (c) 1996, 2012 Oracle Corporation. All rights reserved.
Agent Version     : 12.1.0.2.0
OMS Version       : 12.1.0.2.0
Protocol Version : 12.1.0.1.0
Last successful upload                       : 2015-03-10 07:28:10
Last attempted upload                        : 2015-03-10 07:28:10
Total Megabytes of XML files uploaded so far : 0.08
Number of XML files pending upload           : 0
Size of XML files pending upload(MB)         : 0
Available disk space on upload filesystem    : 78.16%
Collection Status                            : Collections enabled
Heartbeat Status                             : Ok
Last attempted heartbeat to OMS              : 2015-03-10 07:28:25
Last successful heartbeat to OMS             : 2015-03-10 07:28:25
Next scheduled heartbeat to OMS              : 2015-03-10 07:29:25
Agent is Running and Ready
Sometimes while checking status we often get the followinG:
Oracle Enterprise Manager Cloud Control 12c Release 2
Copyright (c) 1996, 2012 Oracle Corporation. All rights reserved.
Status agent Failure:unable to connect to http server at https://<servername>:<port>/emd/lifecycle/main/ [peer not authenticated]
Agent is Not Running
Any help?

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http://support.apple.com/kb/TS2802
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Will not turn on, will not turn on unless connected to power, or unexpected power off
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