Thanks for posting your comment on the TiVo replacement. I'm sorry to hear that this is making some unwanted noise. Customers like yourself have mentioned previously of some noise but this shouldn't be something that can affect the viewing experience.
Can you tell me if this is noticeable above the TV shows?
I'd demand a replacement if I was you. Also try and make sure the replacement is a Samsung as they are slightly faster than the Cisco versions. Although the installer will probably say he can't give you a choice.
Mine has started making a similar and intermittent tapping noise. Sometimes it almost sounds like there's a cricket trapped in the box or like DVD's sound when the disk is skipping. It doesn't normally affect us watching it when it makes the noise but it does sound odd.
Ironically the intermittent problem I've had for months, where recordings freeze, pixellate and jump seems to have gone away at much the same time.
Does anyone know if this ius the start of a terminal decline for the box?