Mac Address flickering

I have an All-in-one hp touchsmart 600 PC. I have connected it on LAN via ethernet cable. It was working fine then one day the mac address of my hp touchsmart 600 PC changed (The last four digits changed) resulting in port violation on switch. The location of my PC was not changed. No system was attached in its place. After the removal of port violation, the PC started working fine.<br>I want to know if anyone has experienced this problem. Thanks in advance.

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