Audio Systems: cd player, radio chassis, bad earth

Question
ive put a new cd player in and when you turn the volume up the cd player turn off and on and off. it stays on if the volume is low

any suggestions as to why this is happening or how it can be fixed?

thanks!

Answer
Sounds like a lack of power on the live feed or a bad earth. How have you hooked up the head unit, using a proper connector /adaptor or cut and connected wire to wire? Is there an amp?
As a check, take a wire from the perm live wire on the head unit directly to the battery (with an in-line fuse please) if this doesn't cure it then remove that lead, (only do ONE test at a time) run a new earth lead directly from radio chassis to battery earth, if this helps it's a bad earth, recheck all your connections.