No it is not normal. Are you able to see if it occurs using component cables?
normal operation with components but lacking quality of the HDMI
What type of TV do you have and is the HDMI from the Rec directly to the TV or through a AV processor?
rec to samsung lcd
Did it ever work?
no
Is Native Set to On or OFF in HDTV Menu on the Rec?
not sure, will check
Is your TV set to only accept 720p/1080i/1080p?