i have the latest firmware i'm using decent disks (verbatim) and after months of successful burning i'm making coasters. i keep getting read errors half way through the burn. the data is archived properly, but i get a read error every time and sometimes a redundancy check. i'm using nero, pinnacle, and dvd shrink. is my recorder broken, i've cleaned the lens does it need calibrated? any help would be appreciated, thanx!!!!