Sony CD-RW CRX230EE Problem? Please Help




I just bought a brand new Sony CD RW CRX230EE. I am facing a very typical problem i.e. when I burn CDs all are burnt successfully using Nero or CloneCD. But out of 10 CDs 6 CDs (average) are unreadable & 4 are perfect. I used around 3 brands of CDRs. But faced same problem. I have wasted around 17 CDs. Please help.