Pionner 108 Several Problems

I have serveral problem my 108 is only five month age.

PROBLEMS WITH TOAST

the drive reported and error
Sense key ILLEGAL REQUEST
sense Code 0x24
INVALID FIELD IN CDB

AND

sense key MEDIUM ERROR
sense Code 0x73 0x03

AND

sense key ILLEGAL REQUEST
Sense Code 0x21 0x02
BUFFER UNDERRUN

and with finder application:

Can not connect device…

New firmware proccess good.

The optical is bud or dirty?
other problems?

thanks very much

Most of your problems are usually a result of inferior media. It could also be dirty lenses and it wouldn’t hurt to clean them, but I suspect you’ll need to try better media.