Hr24-500 going crazy

I have searched and cannot find any information on the problems I am having with my hr24 receiver.  It at random times will turn itself on, record what it wants when it wants, if you are watching tv it will change the channel, bring up the guide, etc.  I know its not the remote because i have tried it with other 5 remotes I have.  I have tried resetting and reauthorizing.  Has anyone else had the issues or heard of them happening to anyone else?  Thanks.