what the ...

either the media is crap (get some quality discs) or your drive is faulty (i don't really think so).

please show us some scan with ty, ricoh, mcc or sony media.
and throw away any WFKA11 211 media you have left.

you can/should also reset the learnt media with the eeprom utility and update your firmware to KC4B. but make an eeprom update before the reset.