After my yesterday post about Yamaha coaster factory i got several emails saying the same thing..Also i have checked at Yamaha's Tech support

"..Yamaha, therefore, recommends that you take the CD out of your Yamaha drive when it is not being used. Yamaha also recommends a 1/2" air space above and below the CDR/CRW drive. An additional fan would also be a good idea.."
Also some people reported same problems when installed Ez CD Creator v3.5c. They seemed to fixed it when got back to ASPI v4.57 build 1008 (get it from CDR Utils Section, ASPI ME!).