Using CDR's in a standard head unit or changer will kill the laser very quickly. Only play original cd's or lose the cd player altogether, choice is yours

why does that happen i dont play copies in the car luckily
Put very simply ... a "purchased" CD is "stamped" from a sheet of foil... and the working surface (the rear of the "label") is a mixture of highs and lows... with an actual physical difference existing... albeit very small ......
A "burned" CD (home made) the "foil" has a dye within the surface, when "burned" the dye is heated to change colour and gives the
impression to the laser that the surface is at differing heights, so fooling it into giving the same output as the real highs and lows of the stamped disc.
The problem is .. the laser "knows" it needs to change the focus to get the high and low in focus every time .. but the "dyed" disc is all at the same distance .. so the focus mechanism of the laser is working overtime to achieve very little ... it thus wears out much faster....
Perhaps not totally accurate but gives the basic idea hopefuly