Plays CDs not properly from

I have the CD player Grundig ordered for our children. Unfortunately, the device has wiggled at the first CD, which means that the CD has not been played without short breaks. At first I thought that the CD would be scratched. Therefore, I have the power not the same be returned. After I have played about 10 different CDs (bought CDs, not homemade) and it came with all the CDs mentioned dropouts, it was clear that there is but the device. The CDs run on our other CD players properly. The unit was sent back to the seller and under the guarantee of the purchase price has been paid. Grundig I had hoped for better quality.