I audiovox vod702 installed in my sienna. it will play burned dvd-r's for about 2 weeks only. afterwards, it will not recognize the dvd the the disc just keeps spinning. however, these dvds will play on dvd players at home or my computer. regular dvds continue to play without any problems. anyone have any idea why? I've tried 2 different dvd's (TDK and Ritek)