o.k this is a retype of stereo work only cold/cool. o.k. i installed a sony stereo CD player. it worked for 2 months or so during the winter time. while driving i hit a pot hole the CD was still playing , but all the button(RW, FF, Stop...etc) didn't work at all.. the only button that seem to work was the ejected button.. and it seems that when the weather is over 50 degrees the stereo doesn't work at all.. but when it's cold(under 40 F). it plays. but non of the button works. so i have to listen from song one to end.... one of my friend's told me it's the ground that's messup in my car .... can anyone please help me.. so i don't need to buy a new stereo...