Hmp3000/79 help

Hi

I am having problems with my media player. I have connected a 1tb hard drive to the HMP3000 and after watching several avi's for 35 mins approx a message appears "video format in the file is unsupported"

I have watched the avi's on my mac which are fine, I have updated the firmware. I have spoken to Phillips customer care and they told me to take it back to the shop and then a replacement was given to me but I still get the same message whilst watching avi after 30 mins or so.

please help

thanks

Mark