While testing my new Zoom F8: - I purchased two LEXAR 64GB 633x SDXC class 10 - U3 professional sd cards. - after my recorder's approval, in the store !
In the store I ran the quick performance test = OK ( I tested one card and bought the 2nd without testing it )
Home I ran the full ( long ) performance test several times : SD card-slot 1 = NG ?! - SD card-slot 2 = OK
I exchange my sd cards - sd-card in card-slot 1 to card-slot 2 = full ( long ) performance test = SD card-slot 1 = NG ?! - SD card-slot 2 = OK
Problem is the sd card or/also the card-slots ?